How to Choose the Right Photo Adapter for Microscopes (Without Sacrificing Image Quality)

February 25, 2026

A practical guide for dental and medical teams capturing crisp photos and video through a surgical microscope

Documenting procedures through a surgical microscope is no longer “nice to have.” High-quality images support patient communication, case acceptance, referrals, teaching, and defensible documentation. The challenge is that a photo adapter for microscopes is not a universal part—small mismatches in mount type, magnification factor, or sensor size can lead to vignetting, soft corners, dim images, or a camera that simply won’t reach focus.

At DEC Medical, we help medical and dental teams across the United States select adapters and extenders that improve compatibility and ergonomics—without forcing a full microscope replacement.

What a microscope photo adapter actually does

A photo adapter is the “translator” between your microscope’s photo port (or beam splitter + camera port) and the camera you plan to use. In most setups, the adapter must do three jobs:

1) Mechanical compatibility
Correct thread/mount (commonly C-mount), correct port diameter, and correct interface length.
2) Optical matching
The adapter’s magnification (or reduction) factor helps match the microscope’s image circle to the camera sensor to avoid vignetting and preserve field of view.
3) Focus and parfocal performance
The camera image should focus predictably—ideally staying parfocal with the eyepieces, depending on the microscope design and camera path.

The 4 decisions that determine whether your photo adapter will work

Decision #1: Your camera mount (C-mount, camera brand mount, or custom)

In microscopy, C-mount is the most common camera interface used for dedicated microscope cameras and many clinical documentation cameras. C-mount adapters are widely available in different optical factors (0.35x, 0.5x, 0.65x, 1x, etc.). Many vendors describe these adapters as “relay lenses” or “reduction lenses,” depending on how they scale the image onto the sensor. (amscope.com)

 

Decision #2: Your microscope’s camera port type and size

Photo ports vary by manufacturer and even by model year. Some systems use a slip-fit tube size (often 23.2 mm on many lab-style ports), while others use proprietary ports or threaded interfaces. This is where teams lose time: an adapter can be “the right C-mount” yet still not physically fit your port, or it fits but doesn’t position the optics at the right distance for focus. (amscope.com)

 

Decision #3: Sensor size and the adapter’s magnification factor

Sensor size is a major driver of field of view and vignetting risk. A common, practical matching approach is to pair larger sensors with higher adapter factors (closer to 1x) and smaller sensors with stronger reduction (e.g., ~0.35x). (microscopes.com.au)

 

Decision #4: Your goal (teaching/recording vs. still photography vs. tele-mentoring)

If your priority is teaching on a monitor, you may value a wide, bright image with stable exposure and a predictable working setup. If your priority is still photography for documentation, you may prioritize resolution, color accuracy, and minimizing edge distortion. The “best” adapter is the one that fits your workflow—clinically and ergonomically.

Quick comparison: common adapter factors and when they make sense

Adapter factor Typical use-case What you’ll notice Common pitfalls
0.35x Smaller sensors; wide teaching view (amscope.com) Wide field of view; bright image May feel “too wide” for detail shots; may reduce perceived magnification
0.5x A common match for ~1/2″ sensors (amscope.com) Balanced view; good all-around option Can vignette with larger sensors; can look “cropped” if mismatched
0.65x Often paired with ~2/3″ sensors (microscopes.com.au) More “true to eyepiece” field of view Not ideal for very small sensors (image may look zoomed-in)
1.0x Larger sensors (up to ~1″ class) (amscope.com) Max sensor coverage; reduced vignetting on larger chips Can be too “tight” for small sensors; less forgiving of alignment
 
Reality check: Adapter factor is only one piece of the puzzle. Port design, beam splitter configuration, and camera back-focus all influence results. If your images are dark, vignetted, or difficult to focus, it’s often a configuration issue—not a “bad camera.”

Did you know? (Fast facts that save time)

A larger sensor doesn’t automatically mean “better” in microscopy.
If the adapter doesn’t project a large enough image circle, the corners darken (vignetting) and the field of view can look uneven.
A 0.5x adapter often widens the view and can feel “more usable” for teaching.
Reduction lenses are commonly used to better match the microscope output to smaller sensors and to increase the field of view. (amscope.com)
Disinfection matters for camera accessories near the operatory field.
Follow manufacturer instructions, and when items can’t tolerate reprocessing, use barriers and an EPA-registered hospital disinfectant (as appropriate) between patients. (cdc.gov)

Step-by-step: how to pick the right photo adapter for your microscope

Step 1: Identify your microscope make/model and the photo path

Determine whether your microscope uses a dedicated camera port, a trinocular port, or a beam splitter configuration. In surgical microscopes, the beam splitter choice can affect brightness to the eyepieces vs. the camera.

 

Step 2: Confirm the camera mount and sensor size

If it’s a microscope camera, it’s often C-mount. If it’s a DSLR/mirrorless solution, you may need a different interface and more careful planning around focus distance. For C-mount cameras, sensor size is frequently stated as 1/3″, 1/2″, 2/3″, or 1″. (microscopes.com.au)

 

Step 3: Choose an adapter factor that matches your sensor and your workflow

A widely used rule of thumb is pairing 1″ with ~1x, 2/3″ with ~0.65x, 1/2″ with ~0.5x, and 1/3″ with ~0.35x (or similar). It’s a starting point—not a law of physics—but it’s useful for avoiding obvious mismatches. (microscopes.com.au)

 

Step 4: Plan ergonomics early (this is where extenders matter)

Even a perfect optical match can create an awkward camera position that interferes with clinician posture, assistant access, or operatory layout. A properly designed extender can improve reach, cable routing, and line-of-sight while reducing “workarounds” that lead to fatigue over long procedures.

 

Step 5: Validate with a quick test checklist

Before you commit, check:
• No dark corners at your common zoom levels (vignetting)
• Acceptable brightness with your beam splitter settings
• Sharp center-to-edge performance for stills
• Predictable focus behavior (ideally close to parfocal)
• Stable mount with minimal torque on the microscope head

Where DEC Medical fits in (compatibility + ergonomics)

DEC Medical has supported medical and dental professionals for decades with microscope systems and accessories designed to improve day-to-day usability. If you’re trying to connect a camera to an existing microscope—or improve posture and workflow with extenders—our focus is practical compatibility: selecting the adapter style, magnification factor, and physical configuration that works with the microscope you already own.

 

Local angle: serving New York roots, supporting clinics nationwide

While DEC Medical’s long-standing relationships were built by supporting the New York medical and dental community, many documentation challenges are the same across the United States: multi-operator rooms, tight footprints, and increasing demand for patient-friendly visuals. The right photo adapter (and the right physical layout) helps standardize outcomes across providers, operatories, and procedure types.

Want a fast compatibility check for your microscope + camera?
Send your microscope model, current port/beam splitter configuration, and camera sensor details. We’ll help narrow down a photo adapter setup that protects image quality and supports comfortable ergonomics.

Contact DEC Medical

 
Helpful to include: camera make/model, sensor size (e.g., 1/2″), desired output (photos, live video, both), and any ergonomics constraints.

FAQ: photo adapters for microscopes

Why do my microscope photos have dark corners?
Dark corners (vignetting) usually mean the projected image circle from the adapter doesn’t fully cover the camera sensor. This is common when a larger sensor is paired with too much reduction (for example, using 0.5x when a 1x relay lens is needed for a larger sensor class). (amscope.com)
Is a 0.5x adapter always the best choice?
No. A 0.5x adapter can be excellent for many setups (especially with ~1/2″ sensors) and can widen the field of view, but it can vignette on larger sensors or feel too “zoomed-out” for certain documentation needs. (amscope.com)
Can I use the same adapter for video and still photography?
Often yes—if the sensor size and mount match, and the optical factor gives you the field of view you want. Some teams prefer a wider factor for teaching video and a different setup for detailed stills, but many clinics run a single configuration successfully.
What information do I need before ordering a microscope photo adapter?
Microscope make/model, camera make/model, mount type (often C-mount), sensor size, and how the camera is connected (trinocular/photo tube vs beam splitter). If available, note your port diameter or thread type and any existing adapter part numbers.
How should camera components near the operatory be cleaned?
Follow the manufacturer’s instructions. When appropriate, use barriers and disinfect between patients with an EPA-registered hospital disinfectant as recommended for noncritical items, and keep reprocessing instructions accessible. (cdc.gov)

Glossary (quick definitions)

C-mount
A common camera mount standard used by microscope cameras and adapters for connecting to a microscope photo port.
Relay lens / reduction lens
Optics inside an adapter that scale the microscope image onto the sensor (e.g., 0.5x reduces magnification to widen field of view). (amscope.com)
Vignetting
Darkening of image corners when the sensor is larger than the projected image circle or when the optical path is partially blocked.
Sensor size (1/3″, 1/2″, 2/3″, 1″)
A common way microscope cameras describe chip class; it helps determine which adapter factor best preserves field of view. (microscopes.com.au)
Beam splitter
An optical component that sends part of the microscope’s light to a camera port and part to the eyepieces, impacting brightness to each path.

Zeiss-Compatible Microscope Adapters: How to Improve Ergonomics, Imaging, and Workflow Without Replacing Your Microscope

February 2, 2026

A practical guide for dental and medical professionals choosing Zeiss-compatible microscope adapters and extenders

If your microscope optics are still excellent, replacing an entire system just to solve reach, posture, or camera-compatibility issues rarely makes sense. In many practices, the smarter fix is a purpose-built adapter or extender that improves ergonomics, supports modern imaging, and restores day-to-day efficiency—while keeping your current microscope in service.

DEC Medical supports medical and dental teams nationwide, with deep experience helping clinicians select compatible adapters/extenders that enhance posture, reach, and integration across microscope manufacturers.

What “Zeiss-compatible” really means (and why it matters)

“Zeiss-compatible microscope adapter” is often used as shorthand, but compatibility is rarely a single yes/no checkbox. In real-world setups, you’re matching multiple interfaces at once: the microscope’s photo port geometry, the optical relay (if any), and the destination device (camera, beam splitter, assistant scope, documentation system, etc.).

A Zeiss-compatible solution should be evaluated on mechanical fit (dimensions and locking method), optical performance (magnification factor and field coverage), and workflow impact (mounting stability, cabling clearance, and repeatable positioning).

Why adapters and extenders can change ergonomics more than you expect

Ergonomics isn’t just “sit up straight.” It’s the relationship between your working distance, shoulder position, head/neck angle, and how often you’re forced to break posture to regain a view. Small geometry changes—like moving the microscope head forward, improving clearance over the patient, or relocating a camera assembly so it doesn’t push your posture—can reduce micro-adjustments that add up over long procedures.

An extender can help when the microscope body can’t reach a comfortable position without compromising assistant access or patient positioning. An adapter can help when a camera mount causes vignetting, forces awkward routing, or fails to hold alignment reliably.

Common “ergonomics” symptoms

Neck craning to re-center the image, shoulders elevated to keep hands in view, frequent chair resets, or repositioning the patient to match the microscope (instead of the other way around).

Common “compatibility” symptoms

Dark corners (vignetting), an image circle that doesn’t fill the sensor, soft edges, unstable camera positioning, or mismatched thread/port standards on your imaging chain.

Key specs to check before buying any Zeiss-compatible adapter

The fastest way to avoid costly returns is to confirm these five variables up front. Even when an adapter is described as “Zeiss compatible,” the camera and optical path details still determine whether you’ll get full-field coverage and the magnification you expect.

1) Camera mount standard (often C-mount)

C-mount is extremely common in microscopy imaging chains. The C-mount thread is nominally 1 inch diameter with 32 threads per inch, and it has a 17.526 mm flange focal distance. (en.wikipedia.org)

2) Photo port diameter / interface

Many “Zeiss” photo-port adapters reference a 30 mm outer-diameter photo port into C-mount. Confirm what your microscope accepts and how it locks (slip fit, clamp, bayonet, etc.). (microscopeinternational.com)

3) Reduction / relay factor (0.35×, 0.5×, 0.65×, 1×)

The factor should match your sensor size and your documentation goals. As an example of how manufacturers specify this, Zeiss-oriented C-mount relays are often offered in multiple factors tied to camera sensor sizes (for instance 0.35× for smaller sensors up through 1× for larger sensors). (microscopeinternational.com)

4) Telecentric vs. non-telecentric design

Some adapters are described as telecentric, which can help maintain consistent magnification and reduce certain edge artifacts depending on the imaging path and sensor. If you’re documenting for education or referrals, optical consistency matters. (microscopeinternational.com)

5) Physical clearance and balance on the microscope head

A camera + adapter stack that protrudes into your working envelope can quietly create posture problems—especially in dentistry where clinician and assistant positions are tightly constrained. Always consider cable routing, assistant scope clearance, and head balance before committing.

Quick comparison: Adapter vs. extender vs. full system replacement

Option Best for What it improves Watch-outs
Microscope adapter Camera/documentation integration, compatibility across components Mount matching, image coverage, stable alignment Wrong reduction factor can cause vignetting or unexpected framing
Microscope extender Ergonomics, reach, clearance, positioning Neutral posture, assistant access, less repositioning Must be mechanically robust and balanced to prevent drift
Replace microscope When optics/mechanics are truly limiting or service life is over Everything (optics, lighting, ergonomics, imaging) Highest cost and workflow disruption; training + integration time

If your primary complaint is posture/reach or camera compatibility—not optical clarity—adapters and extenders are often the most efficient first move.

Step-by-step: How to spec the right Zeiss-compatible adapter (the 10-minute checklist)

Step 1: Identify your microscope model and photo port details

Note the exact model, the port diameter/interface, and whether you’re using a beam splitter or trinocular head. If documentation is intermittent vs. always-on, that changes mounting priorities.

Step 2: Confirm your camera sensor size and desired framing

A mismatch between relay factor and sensor is a common cause of dark corners or wasted resolution. Many Zeiss-oriented C-mount relays are offered in different magnifications tied to typical sensor sizes. (microscopeinternational.com)

Step 3: Decide if your priority is ergonomics or imaging (or both)

If you’re trying to stop leaning forward or twisting to see, an extender may deliver more comfort than a camera upgrade. If your documentation is inconsistent, the right adapter (and correct relay factor) can immediately improve image quality and consistency.

Step 4: Validate workflow fit: clearance, balance, cable routing

Map out where the camera will sit relative to the assistant position, overhead light, and typical patient head positions. If the assembly collides with your routine setup, it will either be removed or used less—defeating the purpose.

Step 5: Choose a vendor who can troubleshoot compatibility before shipping

A quick pre-check (model, port, camera, and intended use) can prevent buying the “right part for someone else’s microscope.”

If you want help mapping your setup, DEC Medical’s products and adapter options are a good place to start, especially for practices upgrading documentation or improving compatibility across systems.

Did you know?

“C-mount” describes the mount standard—not the lens’ intended use—so optical relay choices still matter for sensor coverage and framing. (en.wikipedia.org)

Many Zeiss photo-port-to-C-mount adapters are offered in multiple magnification factors (e.g., 0.35× through 1×) to better match common camera sensor sizes. (microscopeinternational.com)

If an accessory has no direct or indirect tissue contact, the FDA notes that biocompatibility information typically isn’t needed in a submission—context that can be useful when evaluating certain non-patient-contact microscope accessories. (fda.gov)

A U.S. practice perspective: compatibility, serviceability, and uptime

Across the United States, many practices run mixed ecosystems: a microscope that’s mechanically solid, a newer camera, and evolving documentation expectations (patient education, referrals, teaching, and records). The adapter becomes the “bridge” that protects your microscope investment while modernizing what surrounds it.

DEC Medical’s long-standing experience supporting medical and dental teams means you can discuss fit, ergonomics goals, and imaging requirements before making a change that affects daily procedures. To learn more about DEC Medical’s background and approach, visit the About Us page.

Want help matching a Zeiss-compatible adapter to your exact setup?

Share your microscope model, current photo port configuration, camera make/model (if applicable), and what you’re trying to improve (ergonomics, documentation, reach, clearance). DEC Medical can help you narrow options quickly and avoid compatibility surprises.

Contact DEC Medical

Prefer to browse first? Explore microscope adapters and compatibility solutions.

FAQ: Zeiss-compatible microscope adapters

Will any “Zeiss-compatible” adapter work with any Zeiss microscope?

Not always. “Zeiss-compatible” may refer to a specific photo port diameter or a set of microscope families. Confirm your exact microscope model and port/interface, then match the adapter’s mechanical fit and optical relay factor to your camera/sensor.

What is a C-mount, and why do I keep seeing it?

C-mount is a common lens mount standard used in microscopy and machine vision. It uses a 1-inch, 32 TPI thread and a 17.526 mm flange focal distance. (en.wikipedia.org)

How do I choose 0.35× vs 0.5× vs 1×?

Match the relay factor to your camera sensor size and the field of view you want. Many product families list recommended factors for typical sensor sizes (for example, smaller sensors often pair with lower factors; larger sensors may use 1×). (microscopeinternational.com)

Can an extender affect image quality?

A properly engineered extender should maintain mechanical stability and intended optical geometry. The main risks are drift, vibration, or balance issues that make positioning inconsistent—so build quality and correct installation matter.

Do microscope accessories need biocompatibility testing?

It depends on whether the finished device/accessory has direct or indirect contact with the body. The FDA notes that if there is no direct or indirect tissue contact, biocompatibility information is not needed in a submission. (fda.gov)

Glossary

C-mount

A common screw-thread lens mount used in microscopy and machine vision; nominal 1-inch diameter, 32 TPI, with 17.526 mm flange focal distance. (en.wikipedia.org)

Reduction factor (e.g., 0.35×, 0.5×, 1×)

The optical magnification between the microscope photo port and the camera sensor. The right factor helps the image circle match the sensor to reduce vignetting and optimize framing. (microscopeinternational.com)

Telecentric (adapter design)

A design approach sometimes specified for microscope photo adapters that aims to maintain more consistent magnification and geometry across the field, depending on the optical path. (microscopeinternational.com)

Biocompatibility (regulatory context)

Evaluation of a device’s biological safety based on how it contacts the body; the FDA emphasizes assessing the finished device and notes that devices without direct/indirect tissue contact may not need biocompatibility information in a submission. (fda.gov)

Looking for more ways to improve microscope ergonomics and compatibility? Visit DEC Medical’s homepage or browse updates on the blog.

Microscope Adapters in Dentistry & Medicine: A Practical Guide to Compatibility, Ergonomics, and Better Workflow

January 6, 2026

Small hardware changes that protect posture, expand capabilities, and keep your microscope investment working harder

If your team already relies on magnification—endodontics, restorative dentistry, perio, ENT, plastics, ophthalmic workflows, or microsurgery—your microscope is the hub. The challenge is that practices evolve faster than the hardware: operators change, rooms get redesigned, cameras get upgraded, and procedures demand new angles. This is where the right microscope adapters and extenders can make an outsized difference—improving compatibility, reducing operator fatigue, and helping you standardize your setup across locations in the United States.

Why microscope adapters matter (beyond “making things fit”)

In surgical microscopy, an “adapter” isn’t just a connector. It’s often the difference between a microscope that’s comfortable, teachable, and documentable—versus a microscope that’s technically excellent but underused because the setup feels awkward or limited.

Ergonomics: Proper adapter/extension choices can help align ocular height, working distance, and viewing angle so clinicians can keep a neutral posture—especially during longer endo or microsurgical procedures.

Compatibility: Adapters can bridge different brands and standards (mount interfaces, beam-splitter ports, camera mounts like C-mount), reducing the need to replace major components when you upgrade one part of the system.

Workflow & education: Proper camera/beam-splitter integration supports chairside coaching, documentation, patient education, and team calibration—without compromising the operator’s view.

Common adapter categories (and what to consider)

Adapter / Component Best for What to verify before buying
Microscope-to-accessory adapters
(brand/model interface)
Upgrading capability without replacing the microscope Exact microscope model, port type, mechanical fit, stability under movement
Beam splitter interfaces Adding a camera or assistant observer path Light split ratio needs, camera sensitivity, physical clearance, balance/weight
Camera adapters (often C-mount) Documentation, teaching, patient education Camera mount standard (e.g., C-mount), sensor size vs field-of-view/vignetting, focus/iris control if applicable (amscope.com)
Extenders / reach components Improving working position, accommodating taller operators, optimizing room layout Arm geometry, counterbalance limits, stability, cable routing, repeatable positioning

Practical note: “One-size-fits-all” adapters often create hidden problems (wobble, poor optical alignment, vignetting, or clearance issues). A precise, model-matched adapter typically pays back quickly by saving chair time and reducing rework.

A simple selection checklist for microscope adapters

1) Define the job: Are you solving for ergonomics (operator position), documentation (camera), integration (brand-to-brand), or teaching (assistant observer)?

Tip: Write down your “must-haves” (e.g., must keep binocular view bright; must reach posterior; must fit existing beam splitter).

2) Confirm interface standards: In camera workflows, confirm mount standard (commonly C-mount) and how it mates to your microscope/beam-splitter path. (digitaleyecenter.com)

Tip: If your camera has a larger sensor, you may need an adapter optimized to avoid vignetting. (amscope.com)

3) Check optical consequences: Any added optics (magnification factors like 1X or reduction factors) can change field-of-view and brightness. (amscope.com)

Tip: If your team complains that the image “looks tight” or “looks dark,” the adapter chain may be part of the story.

4) Validate ergonomics in your operatory: The correct extender/adapter is the one that matches your operator height range, assistant position, patient chair geometry, and typical procedure mix.

Tip: If possible, test setup at both “front teeth” and “posterior molar” positions before finalizing.

Quick “Did you know?” facts for microscope users

C-mount refers to a 1-inch diameter threaded mount commonly used to connect microscope cameras and adapters. (digitaleyecenter.com)

Camera sensor size and adapter optics affect whether you get a full, clean field-of-view or dark corners (vignetting). (amscope.com)

A camera integration kit may include multiple parts (e.g., beam splitter + C-mount adapter + cabling), so compatibility is a “system” decision, not a single-item decision. (digitaleyecenter.com)

Local angle: supporting microscope users across the United States

Clinics and surgical centers across the United States often face the same practical constraints: tight operatory footprints, multi-provider rooms, and equipment that must “work together” even when purchased years apart. A thoughtful adapter strategy helps you standardize setups across operatories—so training is consistent, documentation looks the same from room to room, and your team isn’t re-learning the microscope every time they move chairs.

With more than 30 years serving the New York medical and dental community, DEC Medical focuses on microscope systems and accessories that improve ergonomics, functionality, and cross-manufacturer compatibility—especially when the goal is to upgrade intelligently rather than replace everything.

Explore relevant resources: Products | Microscope Adapters | CJ Optik | About DEC Medical

CTA: Get a compatibility check before you order

If you’re trying to match microscope adapters to a specific microscope, beam splitter, camera mount (such as C-mount), or ergonomic goal, a quick pre-check can prevent costly returns and downtime. Share your microscope make/model, current configuration, and what you’re trying to achieve—documentation, teaching, better posture, or improved reach.

Contact DEC Medical

Tip: Include photos of your ports/labels and a short list of what you want to add (camera, extender, assistant scope, splash guard, etc.).

FAQ: Microscope adapters for medical & dental professionals

Do microscope adapters affect image quality?
They can. Any optical elements (for example, 1X or reduction optics) may change field-of-view, brightness, and whether the camera sees vignetting. That’s why the camera sensor size and adapter specification matter. (amscope.com)
What is a C-mount adapter, and why is it common in microscope video setups?
A C-mount adapter is designed to connect a camera with a C-mount interface to a microscope imaging port. “C-mount” refers to a 1-inch diameter threaded standard used widely for industrial and microscope cameras. (digitaleyecenter.com)
Can I add a camera without compromising my binocular view?
Often yes, but it depends on your microscope configuration and how light is split to the camera path (commonly via a beam splitter). It’s best to match the beam splitter and camera adapter as a system so the operator view stays bright and usable. (digitaleyecenter.com)
Why do some camera setups show dark corners?
Dark corners (vignetting) can happen when the adapter optics and the camera sensor size don’t match the microscope image circle. Selecting an adapter optimized for your sensor size can help. (amscope.com)
How do I choose between an adapter and an extender for ergonomics?
If the microscope “fits” but forces awkward posture, an extender (reach/position) may help more than an interface adapter. If your issue is adding a component (camera, beam splitter, accessory) or bridging standards across manufacturers, you’re likely looking at an adapter—sometimes both together.

Glossary

C-mount
A common camera mount standard using a 1-inch diameter threaded interface, frequently used in microscope camera systems. (digitaleyecenter.com)
Beam splitter
An optical component that diverts a portion of the microscope’s light to a secondary path (often a camera or assistant observer) while preserving the primary viewing path. (digitaleyecenter.com)
Vignetting
Darkening at the corners of an image, often caused by mismatch between the camera sensor size and the adapter/optical path. (amscope.com)
Reduction / relay optics (e.g., 0.35X, 1X)
Optics within an adapter that change how the microscope image is projected onto the camera sensor, influencing field-of-view and brightness. (amscope.com)