Quote:
Originally Posted by Startrek
Craig,
That’s a beautiful M8 indeed , you certainly captured some data there
Great detail and colour
It’s a shame your ASI533 has a smallish sensor size ( 11.3mm x 11.3mm ) as you couldn’t quite frame the whole nebula in the image ( or did you crop some edges ? )
I use a 2600MC with my 8” and 6” newts , same EQ6-R mount , the 2600MC has a 23mm x 15mm sensor and I can capture the whole nebula with some interstellar background around it with both scopes
FOV in arc minutes = camera sensor size in mm ( width / height) x 3460 / scope focal length . You can work out whether you can frame your targets with your set up and this FOV equation before your choose them or know what to expect. Bintel has a FOV calculator as well
Still a fantastic image
Well done !!
Martin
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Thanks Martin. Yes, with the 120 it won't fit in the frame. There wasn't much of a crop of the object here, I just cropped it down from square to 5:4 format which I think presents better for this object. It's funny though, for M8 I actually greatly prefer the tighter-in view. I imaged it last year with the Esprit 80, which easily fits the whole object into the frame, and I actually ended up cropping it down to pretty much this exact FOV
Naturally I now have considerably more detail than I was getting by cropping away so much of the Esprit 80 frame though.
I find with a lot of objects I prefer seeing a closer view than fitting the entire thing in, but it does depend on the object. I usually use Sky Safari to check out framing with my gear and pick between the Esprit 80 and 120.
I went from average RMS of around 0.9" to 1.1" or so with plenty of differential flexure to about 0.4" - 0.5" with no flexure. Good times 
Still got a few kinks in the guiding to work out but nothing that seems to materially impact images - I had to discard very few subs from this 
