Information and settings for Andor/Apogee Alta CG16M
Camera parameters
- Name:
Apogee Alta CG16M
- Gain:
1.45 electron/ADU
- read noise:
9
electrons - dark current:
0.01 electron/pixel/sec
typical, but there are hot pixels - linearity limit:
35000 ADU
- Pixel size: 9 micron
- Number of pixels: 4096 x 4109 (includes overscan)
Reduction settings
All images
- Do not use the overscan
- Trim to all of first axis, 4096 on second axis
Reducing bias images
- Only need to trim
Combining bias
- Choose sigma clipping, upper and lower bounds of 5.
- Combine using mean/average
Reducing darks
IF THE DARK EXPOSURE TIME DOESN'T MATCH ANY OF The OTHER IMAGES:
- Trim
- Subtract bias
Combining darks
- Choose sigma clipping, upper and lower bounds of 5.
- Combine using mean/average
- Group by exposure time
Reducing flats
- Trim
- Subtract bias
- Subtract dark
- Scale by exposure time
Combining flats
- Choose sigma clipping, upper and lower bounds of 5.
- Combine using mean/average first, BUT if there are stars in the combined darks then use median instead.
- Scale before combining
- by median
- Group by filter
Reducing science (light) images
- Trim
- Subtract bias
- Subtract dark
- Scale by exposure time
- Flat correct