9/11/2004

 

Nightfall - Borrego Springs
Sat 9/11/04

M31
Rebel/80ED
guide LPI/C11 f/10

76F, 80 %humidity

average seeing

30x300sec ISO800

polar alignment error ~ 2 and 4 '

 

Nightfall, Borrego springs

 

Optics - Orion 80ED
Camera - Canon Digital Rebel

 

30x300sec

Image Processing Software:

 

images plus

Dark frame substraction: found that adaptave dark subtraction did not work to take out amp glow. used 400 as noise level and 7x7pixels, as the overall avg of pixels in dark was about 400 and hot pixels were larger than 1 pixel. However, the amp glow was about 28000. Because this is so far above bkg perhaps adaptive dark subt did not work.  Use normal dark subt.

combine using adaptive add
ddp level 2229, no sharpening
R-L adaptive restoration, 10 cycles

crop, rotate, final color and level balance in photoshop.