Astronomy Eyepiece

31.75mm Eyepiece to C-mount Fixed Telescope Eyepiece Adapter

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

The 31.75mm Eyepiece to C-mount Fixed Telescope Eyepiece Adapter connects a C-mount camera to a 31.75mm diameter eyepiece tube.

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Product Overview

The 31.75mm Eyepiece to C-mount Fixed Telescope Eyepiece Adapter connects a C-mount camera to a 31.75mm diameter eyepiece tube. It is available in three magnification options: 0.37X, 0.50X, and 0.75X, each designed to match specific sensor sizes from 1/4" to 1". The adapter ensures the camera captures the full field of view when used with a telescope or microscope eyepiece.

Adapter typeFixed
Output31.75mm diameter eyepiece tube
Sensor size compatibility1/4" ~ 1/3", 1/2" ~ 2/3", 1/1.8" ~ 1"
MountingFixed, no adjustment
Optical systemNon-magnifying, field-preserving
MaterialAluminum alloy

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Key Benefits

Connects a C-mount camera directly to a 31.75mm eyepiece tube without optical loss
Three magnification options allow matching the camera sensor size to the eyepiece field
Fixed design maintains alignment and focus during imaging
Reduces the need for custom adapters when integrating cameras with optical instruments
Supports use with telescopes, microscopes and other optical systems requiring C-mount camera integration

Application Scenarios

Attaching a C-mount camera to a telescope eyepiece for astrophotography or planetary imaging
Integrating a digital camera into a microscope system using a 31.75mm eyepiece tube
Capturing images from a fixed telescope setup where the camera must be mounted directly to the eyepiece
Using a C-mount camera with a 31.75mm optical tube in a quality inspection system
Connecting a camera to a polarizing or fluorescence microscope with a 31.75mm eyepiece port

Who It Is For

Astronomy hobbyists and educational institutions using telescopes with C-mount cameras
Microscopy labs integrating digital imaging into existing eyepiece-based systems
Quality control teams using C-mount cameras on inspection microscopes
Research labs performing long-term imaging with fixed optical setups
Manufacturers of optical instruments requiring standardized camera integration

Problems It Solves

A mismatch between C-mount camera sensor size and eyepiece field causes vignetting or incomplete image capture
Using a generic adapter without proper magnification leads to focus shift or image distortion
Lack of a fixed adapter causes misalignment during repeated camera mounting
No standard interface between 31.75mm eyepiece tubes and C-mount cameras requires custom fabrication
Inconsistent magnification between the eyepiece and camera results in incorrect scale in images

Technical Features

Fixed adapter design with no moving parts for stable optical alignment
Three magnification options: 0.37X, 0.50X, and 0.75X for sensor sizes from 1/4" to 1"
C-mount thread (1"-32 UNF) for secure camera attachment
31.75mm inner diameter to fit standard eyepiece tubes
Optical path designed to preserve the full field of view when sensor size is smaller than the available field

Specifications

Adapter type	Fixed
Output	31.75mm diameter eyepiece tube
Sensor size compatibility	1/4" ~ 1/3", 1/2" ~ 2/3", 1/1.8" ~ 1"
Mounting	Fixed, no adjustment
Optical system	Non-magnifying, field-preserving
Material	Aluminum alloy
Surface finish	Anodized black

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

Customization Options

Select the correct magnification (0.37X, 0.50X, or 0.75X) based on the camera sensor size
Choose the model code (FTA037, FTA050, or FTA075) to match the sensor range
Request a custom adapter if a different output diameter or magnification is needed

Comparison With Other Options

Adjustable telescope eyepiece adapter	The fixed adapter offers stable alignment and no focus drift; adjustable types may shift during use or require frequent re-tightening.
Generic 31.75mm to C-mount adapter without magnification specification	This adapter includes defined magnification values to match sensor size, reducing risk of field cutoff or image distortion.
C-mount to 25.4mm eyepiece adapter	This adapter is designed for 31.75mm tubes, which are common in larger telescopes and microscopes; 25.4mm is not compatible with 31.75mm systems.

Use Guide

Select the adapter model (FTA037, FTA050, or FTA075) based on your camera sensor size
Ensure the sensor size is smaller than the maximum field available for the selected magnification
Attach the C-mount camera to the adapter using the 1"-32 UNF thread
Mount the adapter onto the 31.75mm eyepiece tube and tighten securely
Check for image centering and full field coverage; adjust camera position if needed
Use with a telescope or microscope that has a 31.75mm eyepiece tube