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Originally Posted by Octane
Hi John,
This is exactly what I wanted someone to post -- so that I can learn.
I have taken your points on board and will employ them the next time I get out in the field.
Thank you!
Regards,
Humayun
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I have a special interest in your post because Crux was the first image I posted here see:
http://www.iceinspace.com.au/forum/s...ead.php?t=1647
You will see my re-processed version down the thread which looks quite different - and I agree with others - the best thing you can do now is get that piggyback mount going - you should then be able to go out to 200-300mm FL and 2-3 mins or, perhaps 5-6 mins at 50mm unguided that way depends on your mount precision. If you use those Canon zooms you will have to stop down - stars look like trumpets in the corners (spherical abberation) and have halos (Chromatic Abberation) if you don't - I use f8 on my zooms, hell of a penalty to pay but astrophotography is really demanding on those optics..so its $$$ for L glass or stack a lot....