Astronomy Eyepiece

31.75mm Eyepiece to C-mount Adjustable Telescope Adapter

Name: 31.75mm Eyepiece to C-mount Adjustable Telescope Adapter
Brand: AMADA Microscope

The 31.75mm Eyepiece to C-mount Adjustable Telescope Adapter connects a C-mount camera to a microscope or telescope with a 31.75mm eyepiece tube.

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Product Overview

The 31.75mm Eyepiece to C-mount Adjustable Telescope Adapter connects a C-mount camera to a microscope or telescope with a 31.75mm eyepiece tube. It supports three magnification options - 0.37X, 0.50X, and 0.75X - depending on the sensor size of the camera. The adapter is manually focusable and parfocal with the eyepiece, so the image remains in focus when switching between the eyepiece and camera view. It is designed for use with cameras that have sensor sizes ranging from 1/4" to 1".

Adapter TypeC-mount to 31.75mm eyepiece tube
Focus TypeManually focusable
ParfocalYes, with the eyepiece
Sensor Size Compatibility1/4" ~ 1/3", 1/2" ~ 2/3", 1/1.8" ~ 1"
C-mount InterfaceStandard C-mount
Eyepiece Tube Diameter31.75mm

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Key Benefits

Connects C-mount cameras to instruments with 31.75mm eyepiece tubes
Three magnification options match different sensor sizes: 0.37X, 0.50X, 0.75X
Manually focusable for fine-tuning image sharpness
Parfocal with the eyepiece, so focus is maintained when switching between visual and digital inspection
No need to re-focus when changing from eyepiece to camera view, reducing inspection time

Application Scenarios

Connecting a C-mount digital microscope camera to a stereo or biological microscope with a 31.75mm eyepiece tube
Using a camera with a 1/2" sensor on a telescope or inspection instrument with a 31.75mm eyepiece tube
Switching between visual inspection through the eyepiece and digital capture without refocusing
Setting up a documentation workflow where the same image is viewed both through the eyepiece and on a monitor
Integrating a camera into a legacy microscope system that lacks a built-in imaging port

Who It Is For

Electronics manufacturers doing SMD and BGA rework with digital inspection
Laboratories requiring image capture for quality reports and documentation
Educational institutions using microscopes for teaching and student projects
Astronomy hobbyists integrating cameras into telescopes with 31.75mm eyepiece tubes
Precision assembly workshops needing consistent image alignment between visual and digital views

Problems It Solves

A microscope with no camera port cannot be upgraded to digital imaging without a compatible adapter
Mismatched magnification between the eyepiece and camera causes image scale errors
Lack of parfocality forces the user to refocus when switching between eyepiece and camera
No standard interface between C-mount cameras and 31.75mm eyepiece tubes requires custom solutions
Incorrect adapter selection leads to vignetting or incomplete field coverage

Technical Features

C-mount to 31.75mm eyepiece tube interface
Three magnification options: 0.37X, 0.50X, 0.75X
Manually focusable design for precise image alignment
Parfocal with the eyepiece, so focus is preserved when switching views
Designed for use with cameras having sensor sizes from 1/4" to 1"
Supports sensor sizes: 1/4" ~ 1/3", 1/2" ~ 2/3", 1/1.8" ~ 1"

Specifications

Adapter Type	C-mount to 31.75mm eyepiece tube
Focus Type	Manually focusable
Parfocal	Yes, with the eyepiece
Sensor Size Compatibility	1/4" ~ 1/3", 1/2" ~ 2/3", 1/1.8" ~ 1"
C-mount Interface	Standard C-mount
Eyepiece Tube Diameter	31.75mm
Mounting	Screw-on, secure fit
Material	Metal, black anodized finish
Field Coverage	Full field when sensor size is smaller than available

Specifications are taken from the AMADA product data for this item. Confirm critical dimensions with us in writing before ordering.

Customization Options

Choose the correct magnification based on camera sensor size
Select the adapter model (ATA037, ATA050, ATA075) to match your camera's sensor size
Use with any C-mount camera and 31.75mm eyepiece tube instrument
Available in three variants to cover sensor sizes from 1/4" to 1"

Comparison With Other Options

Standard C-mount to 25mm eyepiece adapter	This adapter fits 31.75mm eyepiece tubes, which are common in many microscopes and telescopes; the 25mm version is not compatible with larger tube sizes.
Fixed magnification C-mount adapter	This adapter allows manual focus adjustment, which improves image sharpness and alignment during setup.
No adapter (direct camera mounting)	Direct mounting to a 31.75mm tube without an adapter causes misalignment and focus issues; this adapter ensures proper parfocality and mechanical fit.

Use Guide

Select the adapter model (ATA037, ATA050, ATA075) based on your camera's sensor size
Ensure the sensor size is smaller than the maximum supported size for full field coverage
Attach the adapter to the 31.75mm eyepiece tube and secure it with the locking ring
Mount the C-mount camera onto the adapter and tighten the retaining screw
Adjust the manual focus ring until the image is sharp on both the eyepiece and camera
Verify parfocality by switching between the eyepiece and camera view without refocusing