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Posts posted by DanWebster
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This is my first real effort.
It's the Orion Nebula obviously and using a SkyWatcher 200p on an EQ5 with a Cannon 1100D.
There are around 20 x 30s subs, I can't remember exactly, and they were with the ISO set to 800. I didn't use any darks or flats as I wasn't sure what they were at the time, but I'm learning all the time and hope to do better when I next go out imaging.
I think the scope took a knock when some of the subs were taken, hence the trail, as I wasn't using a remote shutter. I should have binned the offending images, but as it was my first effort I didn't know any better.
Flat Frames - White or Grey?
in Getting Started With Imaging
Posted
What it means by grey and not white, is that the flats shouldn't be saturated.
If you have an exposure that's too long, then every single pixel will be at maximum brightness and there'll be no variation across the image. Whereas you should be able to see any vignetting, finger prints, dust bunnies, etc. These will appear as slightly darker areas, but only if the image isn't saturated.