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Thread: Flat frames always come out black.

  1. #11
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    Default Re: Flat frames always come out black.



    Quote Originally Posted by jazzin View Post
    Could it be that I'm just not waiting till the sky is dark enough?
    That is unlikely. If the Sky gets Too Dark, you don't have enough Light to take Flats...

    As others have said, you want to use Av mode, and you want to see the Histogram "Main Hump" to be in about the Middle (or a bit Right-of-Middle).

    As for finding how to get the T1i Histogram Display: Canon T1i Review: Full Review - Operation
    (Instructions are toward the bottom in the "Canon T1i Playback & Record Review Displays" section. Google is your friend...)
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    Default Re: Flat frames always come out black.

    Thank you Seigell! I've been looking on the Internet for this information
    Scott
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    Default Re: Flat frames always come out black.

    Just figured out how to do it on my camera! Thanks Siegell!
    Scott
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    Default Re: Flat frames always come out black.

    I've been there and done that Scott, I'll say this light gray, blue gray with dust donuts and when you stack them and all the dark areas will be taken out.
    Last edited by stepping beyond; 07-24-2015 at 06:30 PM.
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    Default Re: Flat frames always come out black.

    Ok here is my delimma. I figured out how to use the histogram on the camera so I just retook me 15 individual flat frames. Then I loaded them into DSS and stacked them with my M27 frames. This is pics of my individual flat frames and my master flat after stacking

    Individual.jpg

    MasterFlat_ISO800.jpg
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    Default Re: Flat frames always come out black.

    I see you have a problem there, if it were me I would just use individual frames and forget the stacking for a master until the problem is resolved in your stacking in dss. I don't use DSS.
    Last edited by stepping beyond; 07-25-2015 at 01:45 AM.
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    Default Re: Flat frames always come out black.

    Would it still do what its supposed to do if I use just one frame instead of stacking?
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    Default

    Quote Originally Posted by jazzin View Post
    Ok here is my delimma. I figured out how to use the histogram on the camera so I just retook me 15 individual flat frames. Then I loaded them into DSS and stacked them with my M27 frames. This is pics of my individual flat frames and my master flat after stacking

    <img src="http://www.astronomyforum.net/attachment.php?attachmentid=113408"/>

    <img src="http://www.astronomyforum.net/attachment.php?attachmentid=113409"/>
    I don't see anything wrong with the Master Flat. It ISN'T supposed to be Bright, as it has been Processed and Normalized. The process that Calibrates you Lights involves Division, and needs values in the Master Flat between 0 and 1.
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    Default Re: Flat frames always come out black.

    Well that relieves me. I thought the master flat had to be a grayish color like the individual frames. Thanks. As you can see I'm still learning
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    Default Re: Flat frames always come out black.

    Impossible to diagnose without seeing it. Can you upload a link to a RAW flat frame?
    Stuart Forman


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