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ISO/gain reported as -1  

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(@svego)
Molecular Cloud Customer
Joined: 3 months ago
Posts: 3
September 20, 2020 14:05  

I'm using a Canon 77D and record my subs using an ASIAir. When i load my fits files they are reported as iso/gain -1. The fits headers however do report the correct iso (800). When i load my Canon Raw files it works correct.

 

This is extra annoying because this value is also written in the filename of the master files. This way I don't know what iso the master files are created for.

 

Also see the attached image. I can also provide an example file if that helps the developers.

Capture

 


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(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 2453
September 21, 2020 16:04  

Strange, I'd like to have that subframe to check out if that's ok with you?

Go to https://upload.astropixelprocessor.com and use upload1 (or upload2 till 5) as username and password will then be the same as the username.

Create a directory named “svego-isoreporting” and upload in there. Thank you!


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(@svego)
Molecular Cloud Customer
Joined: 3 months ago
Posts: 3
September 21, 2020 16:15  

@vincent-mod I've just uploaded my file. Please let me know if i can do anything else to help.


(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 2453
September 21, 2020 16:31  

I'll have a look at it asap (probably tomorrow as we're almost having dinner here 😉 ). Thanks for uploading!


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(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 2453
September 25, 2020 14:33  

Sorry, that was today then, bit busy down here.

So I see the issue I think; in the FITS header not only an ISO is reported, but also an EGAIN value of -1. I'm wondering if that is something you can check in your capture software as a Canon 77D doesn't have a gain.


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(@svego)
Molecular Cloud Customer
Joined: 3 months ago
Posts: 3
September 25, 2020 15:07  

@vincent-mod no problem for the delay.

I don't think there is a setting for an EGAIN value in the ASIair. I havent found it anyway.

A value of -1 seems like an invalid value.The software developer in me would probably ignore -1 values 😉


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(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 2453
September 26, 2020 12:30  

Yes, true, I'll mention that to Mabula. But it's also very strange for the ASI to write that in there. Would be nice to report that to them as well. 🙂


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