MGTechDVP
14-04-2012, 05:12 PM
Hi Everyone,
I took these pics on the morning of friday 13th, didn't seem to have too much bad luck.
The whole last quarter moon is a mozaic of 16 x 1 minute stacks using a DMK41au02 CCD through a OIII filter. The OIII seemed to give me a almost perfectly still stream.
The others are just single stacks off the CCD.
The Trifid Nebula is a stack of 40 minutes worth of exposures through a LPR/UHC filter since the moon was lighting things up. I took 30 x 2.5 minute exposures of M20 but only, perhaps, 3/4 were usable (and that was tollerating a little bit of drift on some), the rest had drift that was too much... I'm at a loss, if my polar alignment was out too far, surely all 2.5 minute subs would have streaking... Any advise???
I was using the Celestron NexGuide to autoguide attached to a 80mm refractor on the main tube, then imaged Using the Canon 40D at ISO1250. White balance was set to "K" @ 7200 and the color adjustment all the way in the red/magenta corner to counter the bluish tinge given by the Celestron LPR/UHC filter.
Final Result was Dark subtracted, cropped then scaled down to 30%.
Thanks for looking,
Mariusz
PS: I noticed that the mozaic resolution was shrunk on uploading, the original size was 3000x3000.
I took these pics on the morning of friday 13th, didn't seem to have too much bad luck.
The whole last quarter moon is a mozaic of 16 x 1 minute stacks using a DMK41au02 CCD through a OIII filter. The OIII seemed to give me a almost perfectly still stream.
The others are just single stacks off the CCD.
The Trifid Nebula is a stack of 40 minutes worth of exposures through a LPR/UHC filter since the moon was lighting things up. I took 30 x 2.5 minute exposures of M20 but only, perhaps, 3/4 were usable (and that was tollerating a little bit of drift on some), the rest had drift that was too much... I'm at a loss, if my polar alignment was out too far, surely all 2.5 minute subs would have streaking... Any advise???
I was using the Celestron NexGuide to autoguide attached to a 80mm refractor on the main tube, then imaged Using the Canon 40D at ISO1250. White balance was set to "K" @ 7200 and the color adjustment all the way in the red/magenta corner to counter the bluish tinge given by the Celestron LPR/UHC filter.
Final Result was Dark subtracted, cropped then scaled down to 30%.
Thanks for looking,
Mariusz
PS: I noticed that the mozaic resolution was shrunk on uploading, the original size was 3000x3000.