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M48 Extension 37mm

M48 Extension 37mm
M48 Extension 37mm
Ex Tax: £16.17
  • Stock: 2
  • Model: M48M4837
  • Shipping Weight: 0.15kg
  • SKU: M48M4837
  • GTIN: 9120069914627
  • MPN: M48M4837
  • Location: D2A5

This M48 adapter/extension can be screwed into a M48 camera adapter as if it was a 2" nosepiece, so that you'll be able to use it in a 2" eyepiece holder.
It will give you the necessary increased aperture when imaging with a full frame camera.

Compatible with the following Skywatcher adapters 20238 Nikon M48 Camera Adapter and 20237 Canon M48 Camera Adapter

Application: Celestron Edge HD with focal reducer, OAG and dSLR camera
One of our customer was looking for a solution to connect his dSLR camera via an OAG (Off Axis Guider) with his Celestron Edge HD telescope whilst also having a focal reducer in the optical path.
Celestron's own OAG (Off Axis Guider) would work fine when used without a focal reducer, but the introduced focal reducer causes a problem as the achievable back focus from the focal reducer to the camera sensor is 105mm.

To achieve this we would need a comparatively short adapter to convert from the SC thread into M48.

Model 2956220 offers a 47mm back focus that is just what wee needed.
So here is the recipe:

Celestron Edge HD
Celestron Focal Reducer 0.7X for Edge HD (model 94240 or 94241 or 94242)
2956220   2" ClickLock CL-SC Eyepiece Clamp for SC Telescopes (optical length = 47mm) (THIS PRODUCT)
M48M4837   Lacerta M48 Extension with 37mm length (optical length = 0mm)
OAGhu48 Lacerta OAG (Off Axis Guider) (optical length = 11mm)
dSLR camera (various optical length, i.e Canon dLSR cameras have 44mm depth)

As you can see, the total optical length (based a Canon camera) is 102mm; the missing 3mm can be achived by moving out the M48M4837 extension from the ClickLock clamp by 3mm, thus achieving the perfect back focus distance.

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