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Thread: amp glow?

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    Default amp glow?



    Noticed this when i was starting the post-process and i was wondering if there is anything i can can do about this or is it something i have to live with?
    Its only on the longer exposure it shows up.
    They go away with darks but i wonder if there is something i can do to remove it? Is it something to do with the usb or with the power supply that causing this?
    L_HA_2019-08-05_00-00-40_Bin1x1_400s__-15C amp by Mikael Wahlberg, on Flickr
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    Default Re: amp glow?

    most likely no. glamp glow is an interference from the adc or other circuitry and most cameras have a distinct profile ie direction in your image is based where the adc or other components is located in the circuit , darks frames will remove amp glow of light and moderate amounts to a point where it's non existent, may have problems with very large amounts of glow.

    some cameras have none, have more, or less amp glow, depending on the design of the camera

    a tried to look for the profile of your camera but no luck.
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    Default Re: amp glow?

    Okey that what i was afraid of.. Its not big amp-glow but sure is annoying.
    But the good thing is that it can be removed with darks.
    Is the amp-glow there from the beginning or can it grow after time and use?
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    Default Re: amp glow?

    Quote Originally Posted by Micke187 View Post
    Okey that what i was afraid of.. Its not big amp-glow but sure is annoying.
    But the good thing is that it can be removed with darks.
    Is the amp-glow there from the beginning or can it grow after time and use?
    The longer the exposure, the greater the glow. If you are referring to the aging of the camera - not sure, but it is certainly possible that component age would change the degree and maybe the location of the glow.

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    Default Re: amp glow?

    Amp glow is electrical noise or thermal noise. So the longer the exposure, the more noise you have. Thermal noise is mostly eliminated by the TEC/Peltier cooler on the camera if equipped. Darks or Dark/Flats will remove both electrical and thermal noise. To get the best images you should be using calibration frames no matter what: Darks, Flats and Bias.
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    Default Re: amp glow?

    I see. Yeah on the shorter exposures there arent any glow at all it just on the longer subs. Over 300sec i start too get glow.
    I always use darks on the subs so they go away quite easily so.
    But i noticed them when i looked at one sub after so was a little concerned if something had broken in the camera.
    And the odd thing the glow isnt there on every sub.
    It is just on some of the subs.
    The cooling was set at -15 on all the subs i took.
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    Default Re: amp glow?

    My QSI does not have amp glow but my ZWO 183 does. I found it really does not show up much in the photo subs even though it looks bad in the dark frame in the end it does process out easily.

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    Default Re: amp glow?

    Take a series of dark's and give them a healthy stretch, you should see roughly the same amp glow on all of them.
    It depends on where the supporting electronics are in relation to the actual image sensor as to where the glow is and how much there is.
    My old CCD camera QHY8L you never saw any amp glow. On both my CMOS cameras QHY183C and QHY163M there is a fair amount.
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    Default Re: amp glow?

    as pauls72 said, the amp glow should be constant and even though some of your frames don't seem to show it,it will show up when stretched out , if you have a high signal target the less noticeable it will look, dark frames will take care of all of it, perfectly normal!

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    Default Re: amp glow?

    No i have checked all of the darks and there is no trace of glow? Even when i stretched them very high its just on some of the lights the glow shows up . Hmm and all of them have the exact same cooling -15.
    Will test tomorrow with longer subs to see if the glow is still there.
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