1004X EX-VIEW LONG EXPOSURE ASTRO CAMERA
NGC7331 (Caldwell 30)
Also visible to the left of NGC7331are galaxies NGC 7336, 7335, 7337 in order top to bottom
9th Sept 2002
2min exposures Autoguided with Quickcam on Guidescope. best 23 frames of 28
.
I also checked consecutive exposures and 3 or 4 could be stacked in a row without re-alignment, so it looks like 5min or longer exposures could be feasible
Image details:-
VC200L with FL reducer FL 1250mm F 6.3
GPDX mount with skysensor 2000 goto
1004xJG Peltier cooled camera
B+W QuickCam autoguider on 60mm 700FL guidescope
Guide star Eta Peg mag 2.9, 4deg away
K3CCD tools used for stacking and alignment
Dark subtraction with BlackFrameNR
Photoshop 6 used to generate compensating flat field from image and for slight gausian blur and unsharp mask
