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Thread: Gain and exposure settings for a ZWO ASI178-MM camera

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    Question Gain and exposure settings for a ZWO ASI178-MM camera



    I keep racking my brain. I have been taking exposures using this camera and LRGB filters for a couple of months. I just recently figured out that each filter has it's own focus point, but that was sure to happen. The problem I and having now is I have a new Alstar H-Alpha filter. The other night I took 10, 900 second exposures of M81 and M82 using this camera and filter, using a gain setting of 150. When I use DSS to stack them, I loose any detail I see in the separate images. The stars line up, but the highlights I captured disappear. I think I may have a gain setting issue. Certainly if I can get the amp glow out of my images without loosing the information, life would be good. I have scoured the internet and found a few numbers, but none of those seem to work. Any input would surely be welcome
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    Default Re: Gain and exposure settings for a ZWO ASI178-MM camera

    when you say highlights disappear, do you mean they are saturated ?, it's important not to over expose your target as it can lead to almost a irreversible loss even with good processing.

    also what stacking parameters are you using in deepsky stakker ? average,sigma kapp ectt ?

    can you upload a dropbox of your raw data
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    Default Re: Gain and exposure settings for a ZWO ASI178-MM camera

    I have 8, Ha filter exposures that when I open using Fits Liberator I can see there is some pretty good detail.
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    Default Re: Gain and exposure settings for a ZWO ASI178-MM camera

    I hope this works better than trying to upload stuff. Here is the DropBox Link

    https://www.dropbox.com/sh/ewwpjq12j...vuUkW_ola?dl=0
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    Default Re: Gain and exposure settings for a ZWO ASI178-MM camera

    For DSS, I have tried all the settings to see if it made a difference. Everything just seemed to come up under exposed
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    Default Re: Gain and exposure settings for a ZWO ASI178-MM camera

    That darn amp glow is killing you. Is that the cause of the upper left light source?

    Are you taking flats and bias to cull some of the noise?

    I think your exposure is fine. M82 is looking very nice. M81 is pretty good too. But that light source is flooding the whole image.

    Bryan

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    Default Re: Gain and exposure settings for a ZWO ASI178-MM camera

    Yes, that's all Amp Glow. My Darks, Flats and Bias's do most of the noise and glow except for the very corners. I have nice detail but when I stack it, it just disappears. My ZWO ASI178MM is not cooled, and I know eventually I will upgrade the camera
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    Default Re: Gain and exposure settings for a ZWO ASI178-MM camera

    i'll have a look, the bottom left and right corner look manageable,darks should get that out, the top right corner ouch,kinda looks like a star halo,reflection

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    Default Re: Gain and exposure settings for a ZWO ASI178-MM camera

    yeah the top right also looks like amp glow as when you flick through the images the the dithering puts that glow exactly in one spot ? can you upload the dark files ?

    you should be able to find a profile of your camera chip online to see the typical amp glow pattern for your cmos/ccs chip.

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    Default Re: Gain and exposure settings for a ZWO ASI178-MM camera

    That's about the worst amp glow I have ever seen. The ones in the lower right and left look 'normal' the one in the upper right is out of control!

    You sure that was not a star slightly out of frame?
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