Long Exposure Problem - severe red tint

Discussion in 'Beyond the Basics' started by ontarioguy, Oct 22, 2015.

  1. ontarioguy

    ontarioguy TPF Noob!

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    So I'm new to long exposure, this is my problem:
    I took a couple photos today with my new ND 3.0 filter, and they all have this major red tint over the entire photo (see photo examples).
    I don't know why this is happening because I've used this filter previously and there was no red tint in the resulting long exposure photos.

    My settings used to take these shots (Nikon D7100):
    *bulb mode
    *fstop: 9
    *ISO 125
    *exposure time: 45 seconds for first photo and 1 minute for second photo

    What am I doing wrong?


     

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  2. ontarioguy

    ontarioguy TPF Noob!

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    This is what the colors look like in a regular photo, same spot, same day.
    DSC_2533.JPG
     
  3. DB_Cro

    DB_Cro No longer a newbie, moving up!

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    Red ND? :)
     
  4. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    Are you covering the viewfinder during exposure?
     
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  5. astroNikon

    astroNikon 'ya all Bananas I tell 'ya Supporting Member

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    In the old days, and the better cameras (d700, d750 and above) they have a switch to close the viewfinder.
    Otherwise the light comes in the viewfinder, through the prism and down into the sensor area to give a cast like you have.

    Here's a more extreme example of not covering the viewfinder
    Manual exposure, 6 sec, f/5.6, ISO 400
     

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  6. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    [​IMG]
     
  7. ontarioguy

    ontarioguy TPF Noob!

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    I was using my thumb to cover the view finder. It might be possible that it let red light through, similar to how when you put your thumb over a flashlight bulb it turns red.
    Thank you very much!
     
  8. astroNikon

    astroNikon 'ya all Bananas I tell 'ya Supporting Member

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    if anything, use the camera strap and place it over the viewfinder.
    but be careful with your finger as you may ever so slightly jiggle the camera and induce movement blur or jumps.
     
  9. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    I use a lens cap.
     
  10. astroNikon

    astroNikon 'ya all Bananas I tell 'ya Supporting Member

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    over your lens ?

    I have a 3rd party eyecup so I started using my camera strap but I just made my own cover.
     
  11. Braineack

    Braineack Been spending a lot of time on here!

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    I like the colors compared to the snapshot.
     
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  12. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    Over the VF, silly!
     

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