Just finished getting the 900nc moddified for long exposures. Heres a few test images. Collimation was out on the 5.5" schmidt newt at the time, & I'm still refining the settings on each object.
It seems to be a lot more sensitive than the 840K for some reason...I though they were the same chip?
Wow great work John, love the colours mate.
The 900 does seem more sensitive, can't remember the reason but I thought I had read something somewhere about it.
Hi Al, home for lunch but when I get home this evening I'll give you a bit of a run down on some settings..I don't expect they'll help you much considering the differences between our 2 scopes & the difference between the 840K & the 900nc is like chalk & cheese.
With a 45 sec exposure time as an example using the 840K: Gain 20% Gamma 90% Brightness 60% If you dropped backed to 20 second exposures (for instance) I would then have to up the gain to roughly 50% dropping gamma to 60%
Totally different with the 900nc. The same exposure time (45 sec) would mean gain 70% gamma 80% brightness 75% contrast 90%.
The M42 pic I posted was 20 sec. exps. 10 stacked. With the 840K I can't get the detail seen even with 1 min.
I usually have to spend close to 1 hr on each target previewing different setting before I even consider capturing. What you see on the preview is what you get once capturing.
Good stuff Asi! Care to share any capture/processing details?????
