Quote:
Originally Posted by naskies
Chris,
Are you imaging with a bright moon in the sky, or from a place with lots of light pollution? The example you posted has a very bright skyglow despite the short exposure.
Am I correct in assuming that you have an f/4 imaging scope and an unmodded SLR? If so, I think you're going to struggle to see much/any of Rosette unless you're in dark skies and use very long exposures.
At f/4 (i.e. on your scope), this would be the equivalent of a 600 sec (10 min) sub at ISO 1600. Notice that despite exposing for 24 times longer than in your example, the Rosette is still quite dim here.
It's tough with an unmodded SLR!  |
Hi Dave,
Yes to unmodded DSLR, max ISO is 1600, (although I may try my son's new 550D which has 6400.....one day) and the sky at home has horrendous light pollution (plus the moon was rising at the time), so I wasnt expecting much anyway....something you can see in the 15 sec M1 snap....
The scope is a normal bog standard Skywatcher 200mm F5.
Thanks for all the info, and the time taken to post it with examples, certainly helps me understand the time needed on something so faint... I appreciate it.
Cheers
Chris