Achieving focus with a Baader UHC-S filter and 750mm focal length reflector

[Galactic Wanderer]

HI all, 

Quick query about attaching a 1.25 inch Baader UHC filter to (f5) newtonian - camera does not achieve focus. It looks to be due to the lack of focus travel, particularly being f=5. Ideally do not want to use a barlow, but if this is the only way to get any sort of result then am happy to give it go. 

Currently using a 1.25 to 2 and t 1.25 adapter, greatly increasing the distance between the focuser and the camera. Any way of potentially reducing this? 

Best, 

GW 

[ollypenrice]

I'm not a Newt user but I think the usual answer is to move the primary mirror up the tube. A small movement like this can be done using the collimation screws but for more movement you need to drill the main tube.

You might also be able to find a shorter way of going from 1.25 to 2.

This is probably not the best part of the forum for your question.

Olly

[Galactic Wanderer]

Thanks Olly - realised this on posting and will post in a different part of the forum. Will take a look at your suggestions. 

 

Edited February 23 by Galactic Wanderer