Help! ASI 6200 MM Calibration Woes (Space_Man_Spiff)

Help! ASI 6200 MM Calibration Woes

Clearly I need to relearn how to calibrate and stack images. The old methods that worked for my ASI 1600MM are not working for the 6200MM.

Ver A: Poorly calibrated stack of 77 HA subs x 180 secs @ -10degrees Gain 100 offset 40. Calibrated and stacked in WBPP in Pixinsight with default settings and included 40 flats + 40 darks + 40 bias. It appears it overdid the calibration. This is evident in the lighter areas in the bottom of the image that are from the shadow cast by the OAG and also in the lighter colored dust motes at the top of the image. There is also a lot more noise in this stack compared to Ver B which has no calibration.

Ver B: Same stack of subs but with NO callibration frames. The OAG shadow and dust motes are dark instead of light in Ver A. Very little noise compared to the calibrated Ver A .

Ver C: Single HA flat image. Used NINA and set the target histogram at 35%.

Ver D: Master HA flat image. Stack of 40 flats.

Ver E: Master Dark. I used same exposure time (180 sec) and sensor temp (-10) as the main subs of IC 434.

Ver F: Master Bias. I used same sensor temp (-10) as main subs of IC 434 and exposure time in NINA I set at something like .0001 seconds.

I got the same results when I tried to callibrate the Oiii subs but I only used the oiii flats and did NOT use darks or bias. Same problem of overcorrecting done was done.

Reading online forums I see different schools of thoughts on callibration for the ASI 6200. For those of you that have a minute I would appreciate if you could respond with a comment or personal message on what practice you recommend for callibrating and stacking using NINA and Pixinsight for the ASI 6200 MM (or similar).

Thank you in advance!!!!!

B

Title: ha stack no calibration frames

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C

Title: single HA flat

Uploaded: ...

D

Title: master ha flat

Uploaded: ...

E

Title: master dark

Uploaded: ...

F

Title: master bias

Uploaded: ...

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