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Thank you all.
I am going on the focal length of the lens I have, I don't know if I am thinking on the wrong track.
I have the Sigma f/5-6.3 150-500 mm (225-750 mm 35 mm equivalent), the Nikkor f/3.5-5.6 18-300 mm (27-450 mm), the Nikkor f/1.8 50 mm (75 mm) and the Sigma f/3.5 10-20 mm (15-30 mm).
I want to use the longest lens as this get close enough to bring out some detail in planets and nebula, the other lenses are just too wide to get any thing close enough for any detail, I assume that i need to get 1000 mm focal length or so for some decent shots.
The only decent shot I ever got of Saturn was with a Nikon coolpix 510 at 360 mm (2000 mm equivalent) Just a white disc with clearly defined rings protruding, I got an almost decent Jupiter with some blurred cloud bands with the sigma at 500 mm (750 mm), I have an acceptable Orion Nebula with the Sigma and a decent omega centaurus.
I think my alignment is ok most of the time. so I am thinking a 1000 mm equivalent scope would get me some better clarity.
You are all welcome to educate me if I am way off track I can take criticism, I am a slow learner but getting there.
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