ND64 filter kills some saturation in my image

B

blackdogs377

Well-known member
did anyone notice that putting the strongest ND filter on the DVX (1/64 i think its called) makes the image more grey and dull?

I hate that. Forces me to use shutter speed to lower the brightness instead of the ND filter.
 
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According to Barry Green's book, "...the only image effect is to lower brightness."

I believe that instead of manipulating the shutter speed, using levels in post will uncover the missing color information.

Outside, I always start with f/5.6 and add one or two ND filters. Occasionally, f/6.8 is needed because it's simply too bright.

Are you zoomed way in?
 
jordandov said:
According to Barry Green's book, "...the only image effect is to lower brightness."

I believe that instead of manipulating the shutter speed, using levels in post will uncover the missing color information.

Outside, I always start with f/5.6 and add one or two ND filters. Occasionally, f/6.8 is needed because it's simply too bright.

Are you zoomed way in?
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no, i'm not zoomed in at all.

I will shoot some comparison footage tomorrow. There definately is a difference in color between high shutter speed and nd 1/64
 
Interesting. That definitely doesn't sound right - but I haven't checked it firsthand.
What fstop were you shooting?

If you shoot some comparison footage tommorrow - pull some stills from each one (shutter and ND) and post some uncompressed tiffs.
I'd love to compare them on scopes to see what's there.
 
i never use 1/64
it puts a black sheet over the video to get it less bright, and kills the colors.
bump that shutter speed
 
You seem certain that the shutter speed is the only way to recover the color information. And hey, if that works for you, go for it.

Was that shot from inside? What were the other settings (especially fstop)? Did the DVX request the filter? Have you tried it with motion?

It would be interesting to compare the ND 1/64 footage's color after each channel's level is treated in post with the 1/1000 shutter speed footage's color.

Panning in 24p with a 1/1000 shutter speed? Hire an ant.
 
yea it was shot from inside but i was doing some test shots outside too a few days ago, which is where i noticed it first. But do you not see the obvious color difference between the shots with (ND 1/64 on, shutter off) and (ND off, shutter 1/1000).
 
Man did you do this test just for this thread?

Great job, it does show the difference in color. I never knew that
 
Is it possible that the desaturated is due to IR light? ND does not stop IR and it does effect chips. I have seen it make images overexpose even with plenty of ND, but it seems like it would also cause some color loss.
 
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If you're shooting 24p, don't bump the shutter speed unless you want the image to strobe. If you really don't like the results of that 1/64 ND, get a new ND filter, or try and fix the image in post.
 
jambredz said:
did u compensate for light loss?? ie. open up the iris when u added the ND filter??
Click to expand...
Yes

ryvac said:
Man did you do this test just for this thread?

Great job, it does show the difference in color. I never knew that
Click to expand...
Yes, made it for this thread.

ullanta said:
Did you try white balancing for each condition?
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No. It's not a white balance issue, it is clearly saturation.

And the last example in the test footage shows the problem the best.
 
Sure, saturation, but to me it looks like white balance as well... and a white balance might not solve the issue, but may be one way to improve it.
 
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