Quote:
Originally Posted by gregbradley
Fantastic. You must be stoked.
Tiny tiny stars and nice colour. I wonder how it compares with a 60Da. Of course its full frame and 36mp so that is a big plus.
Did the flats work out OK? I remember ages ago someone posted a really nice image around Orion area with a modded D800 and they complained that the flats were nonlinear and he had trouble getting them to flat out.
Not 100% sure what that meant but I took it to mean that the flats didn't match the lights due to some internal firmware processing by the camera (possibly to do with the analogue to digital conversion - not sure).
Any hint of trouble with flats?
Greg.
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Hi Greg, I know what they meant. The dark frames on the 800 had a very strange pattern, the chip looked like it was split down the middle and had a big blob on one side (only visible under extreme stretch). For wide field you must turn off the lens corrections in camera or you're going to double up when flat fielding.
The link below is to a (slightly cropped) flat fielded, dark and bias calibrated stack of 15 subs. There is a slightly darker band visible along the bottom of the single sub in the OP that is corrected perfectly. The darks and flats when stretched to reveal any structure look as good as anything I'd expect from my QSI683 - although obviously the levels are a bit higher.
http://www.astrobin.com/185480/
cheers,
Andrew.