I have a new ZWO ASI6200 Mono camera and I use the SkyXPro exclusively for image capture. I tried to use Astropixel to process the images and it uses the GAIN value in that process. Calibration failed because the GAIN setting it looked for, logically, under the GAIN setting but it could not be found because GAINRAW was in it’s place. GAINRAW is not a valid variable according to the author of Astropixel.
The FITS header in the L frames and color frames do not meet industry specification regarding the GAIN setting shown in the last few lines as follows:
LFrame:
OFFSET = 1 / camera offset
GAINRAW = 100 / Your gain value (integer)
HIERARCH Bandwidth setting = 60 / Your gain value (integer)
GAINADU = 0.246657639741898 / e/ADU
OBJECT = ‘M31 ‘
RA = ’00 41 52.3’
DEC = ‘+41 18 45’
RedFrame (and all frames beside the Luminence Frame)
OFFSET = 1 / camera offset
GAINRAW = 50 / Your gain value (integer)
HIERARCH Bandwidth setting = 60 / Your gain value (integer)
GAINADU = 0.438626199960709 / e/ADU
OBJECT = ‘M31 ‘
GAIN = 1
RA = ’00 42 06.04’
DEC = ‘+41 23 06.0’
I tried to use Astropixel to process and it failed. The author’s response:
“Thank you very much for sharing this issue.
First of all, I can easily fix this and add GAINRAW to tags in the header that needs to be used… but clearly the GAINRAW tag is not in the FITS specification and it is likely that your capture software is the only one that is using it. So the problem is created by your capture software doing things outside of FITS specification to start with.
It would appear Astropixel is not reading “GAINRAW” correctly, but picking up the “GAIN” line where it exists, and 0 where it does not. Obviously, this is not something I can resolve.
Indeed, the current version does not “know” GAINRAW since it is not in the specification and we never encountered it. We read GAIN and EGAIN if available.
To support your capture software and use GAINRAW as GAIN i need 1 FITS frame so I can implement it correctly. I need to know if there is a tag that indicates the software that created the FITS file like SWCREATE.
Do you know what GAIN then means in your files if we are supposed to use GAINRAW as GAIN? It is really messy I think, but we can solve it, no doubt 😉”
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Does the ZWO driver provide this format or SkyXPro? Either ZWO or Bisque needs to correct it and I don’ t know who that should be so I am posting it in both places.
A response by someone at ZWO would be appreciated to least tell me if this is a SkyXPro issue or a ZWO issue. One or the other needs to correct it.
Thank you,
Gerald Miller
Muskogee OK