Hi everyone:
I have a Nikon D800 DSLR, and haven't received sharply focussed photos
with it yet.
And Nikon on the net, there is an admission that the Auto focus with it
might be out of whack but you know that I will not use that during astro
photography. It was just what came up on a search on the net.
So asymmetry out of focus shouldn't be problem in "Manual" mode, should it?
But here is my Moon photo about 3-4 days ago during gibbous phase.
And it represents what all my astro photos look like, a little out of focus.
Is this a good source? :
http://www.astropix.com/HTML/I_ASTROP/FOCUS/METHODS.HTM
How do I use a Ronchi grating on my scope. I've got a Batinov mask
and a small Ronchi grating I think 100 lines per inch and 1"X2".
Maybe I'll try using parfocal eyepieces.
Thanks.
David