I am getting all the bits together to be able to put another Canon 200mm prime lens on the mini-WASP top plate.  I will use an M26C camera from the top TS80 scope and will put an eyepiece (shock-horror) into the TS80.  I haven’t actually looked through an eyepiece in years.

Goods that have arrived so far:

1)  Canon 200mm f#2.8 prime lens.

2)  Set of beefy scope rings to hold the lens and camera.

3)  Several 72mm – 52mm step-down rings to hold a 52mm IDAS filter in front of the 200mm lens.

4)  A 52mm IDAS filter.

5)  A Geoptik adapter for fitting the 200mm lens to an M26C OSC.

I am making up a pair of Aluminium mounting blocks that go between the scope rings and the top plate.  I will put two mounting holes into the scope rings to prevent twist – they only come with one tapped hole.

I am awaiting delivery of a 4th Paramount counterweight as the 3 that are already on there are right at the bottom of the counterweight shaft, i.e. I can’t put any more weight on top until I get the extra counterweight.

I am also awaiting delivery of a whole bunch of Allen bolts for the scope ring mountings.

So it’s all slowly coming together.  I will also put the Robofocus from the TS80 onto the 200mm lens and see if I can get it autofocusing (I know this is a non-trivial exercise).

As it looks like it will be clear tonight, I have put the 72mm – 52mm step-down adapter on the original 200mm lens and fitted a 52mm IDAS filter.  I set the lens to f#2.8 (i.e. wide open) and I will check yo see if there are any diffraction spikes or not.  If there are still spikes I will put an aperture in the Geoptik to cover whatever part of the lens iris is showing.

Busy, busy 🙂 🙂


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