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31.75mm Eyepiece to C-mount Fixed Telescope Eyepiece Adapter

31.75mm Eyepiece to C-mount Fixed Telescope Eyepiece Adapter

The 31.75mm Eyepiece to C-mount Fixed Telescope Eyepiece Adapter connects a standard 31.75mm diameter eyepiece tube to a C-mount camera sensor. Available in three magnification options (0.37X, 0.50X, 0.75X), it supports sensors from 1/4" to 1" in size. Designed for astronomy and precision optical imaging, it enables direct coupling of telescope eyepieces to digital cameras without optical loss.

  • Direct mechanical and optical coupling between 31.75mm eyepiece tubes and C-mount cameras
  • Three magnification options (0.37X, 0.50X, 0.75X) to match sensor size and field coverage
  • Supports sensor sizes from 1/4" to 1" with proper field coverage
  • Fixed adapter design ensures alignment stability during imaging sessions
  • No additional optical elements introduced, preserving image quality
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Technical features

  • Adapter type: C-mount to 31.75mm eyepiece tube
  • Magnification options: 0.37X (FTA037), 0.50X (FTA050), 0.75X (FTA075)
  • Supports sensor sizes: 1/4" to 1/3" (FTA037), 1/2" to 2/3" (FTA050), 1/1.8" to 1" (FTA075)
  • Fixed mechanical design with no adjustable focus or alignment
  • Threaded C-mount interface compatible with standard C-mount cameras
  • 31.75mm inner diameter for direct fit to standard eyepiece tubes
  • Designed for use with telescopes and precision optical systems

Who it is for

  • Astronomy hobbyists using refractor or reflector telescopes with digital imaging
  • Industrial inspection teams integrating telescope eyepieces into camera-based systems
  • Research labs setting up fixed optical paths for long-term imaging
  • Distributors offering adapter kits for telescope camera integration

Specifications

ModelFTA037 / FTA050 / FTA075
Sensor Size Range1/4" ~ 1/3" / 1/2" ~ 2/3" / 1/1.8" ~ 1"
Adapter TypeC-Mount to 31.75mm Eyepiece Tube
Mount InterfaceC-Mount (standard)
Eyepiece Tube Diameter31.75mm
AdjustabilityFixed (non-adjustable)

Use guide

  • Select adapter model based on your camera’s sensor size
  • Ensure the sensor size is smaller than the maximum supported by the adapter
  • Mount the adapter to the C-mount camera first, then attach to the 31.75mm eyepiece tube
  • Use only with fixed optical systems where alignment stability is required

FAQ

Which adapter do I need for a 1/2" sensor?
Use FTA050, which supports sensor sizes from 1/2" to 2/3".
Can I use FTA075 with a 1/4" sensor?
Yes, but it may cause vignetting due to higher magnification; FTA037 is better suited.
Is the adapter adjustable?
No. It is a fixed adapter with no focus or alignment adjustment.
What is the flange focal distance?
Standard C-mount flange focal distance is 17.526 mm; ensure camera compatibility.
Can I use this with a video microscope?
Yes, if the microscope has a 31.75mm eyepiece tube and a C-mount camera interface.

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