Just wondering if anyone can tell me whether I would benefit at all by using
a 2" T-Adaptor over the 1.25" T-Adaptor that came with my scope.
I plan on using my canon 450D through a SW ED80 for DSO astro-imaging.
A standard 2" T-adaptor works with minimal vingetting for crop frame cameras. For a full frame a CNC Ultrawide should be better as it is a one piece device and does not have the 1.5" restriction caused by the threaded section. I've just ordered one.
I have a 450D (crop frame sensor) and a 102mm f7 achro and have had no vignetting problems with the 1.25" adaptor. I think that it is more of a problem with full frame sensors.
I have a 450D (crop frame sensor) and a 102mm f7 achro and have had no vignetting problems with the 1.25" adaptor. I think that it is more of a problem with full frame sensors.
It also depends on the f-ratio. Faster scopes are more likely to vingette.
The SW reducer flattener is a worthwhile addition to the ED80 with the associated wide T ring there's no vignetting on FF should you upgrade in the future.
Thanks for your replies everyone.
I'm going to have to see if I have any issues when I actually get to use the scope for imaging, seeing as it's been cloudy every night since I got it. I was going to order a variable projection adaptor, thought I might get the larger t-adaptor and save shipping while I'm at it.
I think my scope is an f7.5. That's medium fast isn't it?
