48mm or T thread?

[baileys2611 (Simon Bailey)]

Hi Everyone,

It's been a while for me, but i now have the ability to get back in to my favorite hobby. At the same time I'm getting back into astrophotography (har har...). ahem.

So, building from scratch, I just obtained an MI-250 mount from Cris which is on it's way. Will take a little time to set up on my pier and align etc but I'm looking to build a whole imaging train on what will probably be an RC 10". I'll be using my old QHY8 to begin with.

Question is, should I build the imaging train to suit 48mm or t-thread (which I think is 42mm)? 48mm may be slightly more stable perhaps? any thoughts?

Thanks for looking,
Simon.

[Atmos (Colin)]

Go 48mm so that you don't find yourself wishing you did later on if you decide to put a FX DSLR on the scope at some point.

42mm will not fully cover an FX sensor where as the 48mm will.

[RickS (Rick)]

Bigger is better I like to use Astro-Physics 2.7" from the focuser back to the camera.

[baileys2611 (Simon Bailey)]

Yep, got it. Bigger is better