Long Exposure Problem - severe red tint

ontarioguy

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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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ontarioguy

ontarioguy

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

480sparky

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Are you covering the viewfinder during exposure?
 

astroNikon

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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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480sparky

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ontarioguy

ontarioguy

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Are you covering the viewfinder during exposure?
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

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!
 

astroNikon

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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.
 

480sparky

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I use a lens cap.
 

Braineack

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I like the colors compared to the snapshot.
 

astroNikon

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ontarioguy

ontarioguy

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480sparky

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oh, the back lens cap. I was thinking the front lens cap ... couldn't figure out how you got it to stay on. LOL

Silly me, I just hold it with my fingers. :345:
 

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