View Full Version : help w/ widefield: checklist to get started
28th of December 2008 (Sun), 23:58
ok im looking at a rare clear night coming up hopefully this week and since i dont have work this week due to new years this will be such a good op that i dont want to screw up!
i plan to do widefield photography this week so help me with this checklist so i dont miss a step and in turn miss a rare op!
1. align scope, set tracking to on
2. mount up camera w/ shutter release
-take many 5 minute exposures at ISO 800? is that a good number?
thanks for the help guys! im excited!
29th of December 2008 (Mon), 06:08
What lens are you using? ISO 800 is fine, Not sure about your focal length for the exposures since you're shooting in alt-az.
29th of December 2008 (Mon), 13:15
hmm focal length matters? i planned to use my 16-35. i have a 50, 70-200, and 24-105 too....any of these i would be using them at their widest
29th of December 2008 (Mon), 19:47
I was only asking to get a better idea what exposure lengths you could realistically expect when shooting in alt-az. Also keep in mind that a good alignment is going to be even more important once you start shooting up around 200mm. I would probably start in the 35-50mm range and try some 2-3 minutes exposures. Then zoom way in on those stars at the outer edge of the frame and see if any field rotation is starting to occur. If the stars in the center of the field of view are nice and round and movement is only visible at the edges then that's definitely rotation. If not, go another minute longer and check again. Once you find the limit you can start rapping off multiples for stacking.
29th of December 2008 (Mon), 20:34
ah i see. man...so that wedge is necessary i see. i just wanted some wide landscapey-type shots.
so basically i want to push the limit until i get field rotation.
29th of December 2008 (Mon), 23:00
Yes, but you'll still get some great shots within the limit of your current piggy back set up. Once you get a wedge rotation won't be a factor.
30th of December 2008 (Tue), 03:01
ah thats reassuring. im hoping for a clear day soon! these days have been half cloudy
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