l've been trying some extra long exposures to see how it effects noise levels. Thought l would post this to get a few of the gurus opinions so any thoughts appreciated.
Canon 400D unmodified @ iso 400
Megrez 90 with 0.8 W.O Reducer and Baader UHC-S
1 X 20 min exposure.
Last edited by mick pinner; 25-07-2009 at 10:42 PM.
Nothing wrong with the picture Mick. A bit of field curvature which may require some experimenting with the distance between the 0.8 and the CCD to get the field nice and flat. A bit of a tweak in levels, another tweak in shadows and highlights and contrast and at worst a little adjustment to saturation and this will be a bottler.
Noise looks pretty dam good but darks will always take care of the worst anyway.
Hope this helps.
