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plierle

8" Reflector for Full-Frame DSLR? (AT8in vs Orion 8")

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Hi everyone,

 

I'm looking to buy an 8" newt for astrophotography with my Canon 6D full frame. I'm really only going to be using it for imaging so visual problems (such as back focus) aren't too much of a concern for me. 

I'm aware that probably whatever scope I get won't cover a full frame sensor without vignetting, but does anyone have an opinion on which would be the best?

I have a CGEM mount and Baader MPCC mkIII. 

 

The ones I've been looking at right now are:

1.Orion 8" f/3.9 Newtonian Astrograph

2.Astro-Tech f/4 Imaging Newtonian 

 

I've also heard of the Sky-Watcher Quattro series and Meade LX70 series, I just haven't heard as much about either of those.

Also, optics are my #1 concern. Things like weight or minor mechanical shortcomings that I could potentially fix are not as great factors.

 

Thanks for your input!

Patrick

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Vignetting won't be your main problem but the size of the corrected image circle. I think you'll find it difficult to cover a full frame sensor with most small scopes (only a couple of Takahashi refractors have a big enough corrected image circle). Indeed this is one of the main reasons I've not bought a full frame DSLR, I could never use it with my scopes!

With scopes and Baader MPCC coma corrector you are proposing coverage of an APS-C sized sensor is just about possible. So yes- any of these scopes will be useable, just expect to crop off a fair bit of the image to get round stars. Full frame astro would be great with some nice L series lenses though!

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