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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.

General Information
Weight in Kg 0.15

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