Richie's Creation,
I can't believe how pinpoint the FSQ resolves stars. I've never had a scope that's done this before. I'm floored!
Thank you!
Quote:
Originally Posted by richardo
Pretty wild area looking to the heart of our galactic centre, the star field is massive and this image just shows us how dense things are with the wider fovs...
Just wall to wall...
Gotta love fast scopes with excellent optics!!
Great work H !!
Yes shame about the FW... ain't there always some thing 
All the best
Rich |
Clive,
Cheers! I was browsing Doug's galleries a few weeks ago and came across your IC 4603. I have to say, that's one of the best renditions I've seen of that region. Are you still imaging or have you hung up the boots for a while? Would love to see some more of that FLT action!
Quote:
Originally Posted by Alchemy
Yep, looking nice, I like the dust at 2 o'clock very interesting.
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Gary,
Cheers, mate!
Quote:
Originally Posted by Garyh
Beautiful widefield shot of this interesting snakey thing.
Lovely work Mr H  |
Steven,
Thank you, sir.
Quote:
Originally Posted by sjastro
Fantastic image H.
Steven
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Rob,
Thank you! Well, I think with CCDs having a 16-bit sensor, and a greater well-depth, you're capable of going for longer without too much of an issue. With a DSLR, with the shallower wells, you reach saturation far quicker, not to mention all the other noise that plagues the DSLR.
Luckily, the 5D Mark II gives pretty spectacular results for test images shot at ISO-6400. I might take a 15-second exposure, and boost the resultant exposure by 2 stops using Digital Photo Professional; I check to see if there's any saturated clipping, and make sure the histogram's a decent distance across the X-axis. So, if a 15-second shot at ISO-6400, pushed 2-stops in RAW, gives me good results, I just do the relevant division/multiplication to get me down to ISO-1600 for "correct" exposure. 15->30->60 for the two stops of RAW latitude, and then, 60->120->240 for the 2-stops for the ISO. I then add a little more exposure to account for the extra noise in the image at ISO-6400. 240->300 seconds isn't an altogether huge leap and works well for me.
Quote:
Originally Posted by RobF
Awesome work Humayun. Interesting what you say about limiting exposure to control over exposure. Many people seem quick to suggest long exposures without considering this in relation to focal ratio.
Hope the SBIG and filterwheel are back together again soon.
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H