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Filed under: Cameras •Production •Tips •Training •

F35 IR Filter Shoot-Out

Here’s what we learned from this test:

The Sony F35, like the Panavision Genesis, is sensitive to far red, not infrared. It has a very effective Hot Mirror filter on the sensor but, with almost any amount of ND in front of the lens, synthetic fabrics and some kinds of dye will turn red or maroon due to far red contamination.

The problem can be noticeable when using as little as an ND .30 filter, but is definitely noticeable at ND .60.

Hot Mirror filters do not, on their own, solve this issue. Hot Mirrors, or filters with dichroic coatings, are designed to cut at different wavelengths, and some of the cuts are too high to have any effect. A dichroic Hot Mirror that cuts at 720nm will have some effect, while those that cut at 750nm have no effect.

The Schneider Tru-Cut 680 filter, which cuts at 680nm, works very well on the F35 but causes severe cyan vignetting on wide angle lenses due to the off-angle color change exhibited by dichroic filters. This vignetting is unacceptable on lenses wider than 32mm.

Tiffen IR ND filters do as good a job at cutting far red on the F35 as the Schneider Tru-Cut 680 does, but without the dichroic coatings that can cause color vignetting on wide lenses.

Tiffen IR ND filters CAN NOT be combined with regular ND’s, as the amount of far red filtration built in to the IR ND line of filters is proportional to the amount of ND. A strong Tiffen IR ND filter will look more yellow-green than a light one.

Do not buy Tiffen Hot Mirror IR ND filters for use with the F35 or the Genesis as that’s a waste of money. Save that enormous expenditure for your cheaper cameras, like the RED.

Thanks very much to Jay Farrington and Chater Camera for their help with this test. Thanks also to camera assistant Rod Williams for his exceptional help, and also to Videofax for their kind assistance in helping with additional F35 filter testing.

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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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