[gregbradley]

Originally Posted by Startrek

Greg,
I use both 2600MC and 2600MM cameras in my carbon Newts
Cooling kept at -10C all year
Gain setting for Broadband Low Gain 0 offset 50 Ascom driver
Gain setting for Narrowband Medium Gain 100 HCG mode offset 50 Ascom driver
I shoot a new Dark Library every 8 months for both Gain settings with cooling -10C and a selection of exposures times for both Broadband and Narrowband
I shoot a new Bias Library every 8 months for both Gain settings with cooling -10C and exposure time 0.000032sec

Flat Frames
Flats are captured with Huion A3 and A2 adjustable led light pad
I take Flats for each filter each session ( single night and multiple nights provided camera is not removed )
My TS GPU coma corrector unfortunately introduces vignetting into my image train so Flats are a must
Capture software is APT , I use the CCD Flats Aid tool and Histogram tool
Flats are captured with ADU range on histogram around 11,000 to 32,000 ADU ( ADU target value subject to illumination brightness and exposure times but usually between 20,000 to 28,000 ADU depending on filter type )
Flats exposure times for Broadband are around 0.15 to 0.50 sec max
Flats exposure times for Narrowband are around 1 to 5 sec max

Calibration Process
Originally used DSS for many years
Now I use ASTAP which is excellent ( free open sourced stacking and plate solving software)
Load lights specific filter , analyse all frames
Load Darks from Library same Gain and exposure as lights , analyse all frames
Load Flats specific filter same Gain and temp as lights , analyse all frames
Load Bias from Library same Gain and temp as lights , analyse all frames
Calibrate Flats with Bias ( or Flat Darks ) to create Master Flat
Create Master Dark from Darks
Set Alignment to Star Alignment
Set Stacking Algorithm to Sigma Clipping Average ( improved )
Stack frames
Save stacked file as fits
Repeat for all filters

Never had an issue with Calibration for both the 2600MC and 2600MM cameras
Vignetting eliminated
Clean frame no dust bunnies
Even illuminated field

Hope the above is what you’re referring too ?

Cheers
Martin

Thanks Martin,

That's helpful.

Greg.