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Filed under: Cameras •Production •Tips •Training •

F35 IR Filter Shoot-Out

IS THERE ANYTHING TO WORRY ABOUT?

We took a look to see if there’s anything to worry about when using ND filtration on the F35. Once again, here’s the camera with no filtration:

Here’s the same shot with a Schneider ND .30 filter:

At this point we saw a tinge of red contamination in the black DSC chart bag, which was quite surprising when using so little ND. It doesn’t read quite as strongly in this JPEG but it was very apparent on our monitor.

We swapped the ND .30 out for an ND .60:

Now we can definitely see the chart bag take on a reddish hue that wasn’t visible to our eyes. In the interest of time we jumped right to the heaviest possible filter pack we could use under our test conditions, the Schneider ND .9 and ND 1.2:

The overall red cast is normal. It’s extremely hard to make a neutral density filter that is truly neutral in color, and the more ND one uses the more obvious the color shift becomes. Due to the F35’s ability to see a much broader spectrum of color than other cameras, it is extremely sensitive to small shifts in hue that wouldn’t be much of an issue on other cameras. For this reason the F35 is equipped with a number of digital white balance slots to compensate for hue shifts in different filter packs.

The true test is when we white balance this image and see what color the chart bag really is:

And there it is: significant IR or far red contamination in the DSC chart bag. This image is much more subdued than what we saw on a CRT, where the black polyester of the chart bag was a rich maroon.

So far there aren’t any surprises here. Let’s move on to the filter tests and see if we can figure out how good the sensor’s built-in IR cut filter really is…

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Will there be a Sony EX shootout? There would be a tremendous amount of interest in one.

Posted by DR  on  02/20  at  10:01 AM

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I’m working on that right now. I’m hoping to have it up in the next week. I’ve got one more set of filters to test, and so far the results have been very surprising—in a good way!

Posted by Art Adams  on  02/20  at  01:01 PM

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Excellent! I can’t wait for the results. (along with a couple thousand anxious EX users)

Posted by DR  on  02/20  at  01:23 PM

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Agree with DR. I am really interested in the results too.

Posted by Marcis Gasuns  on  02/20  at  04:37 PM

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ANOTHER good article!

Posted by billS  on  02/21  at  05:24 AM

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