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Filed under: Cameras •Production •Tips •Training •

RED Hot Mirror Shoot-Out

WHAT WE LEARNED

Different levels of IR/far red cut have different effects, depending on the camera and filter combinations.

The lower the cut, the heavier the dichroic coatings seem to be—and the more likely you’ll see color vignetting (usually a cyan color) on wider lenses.

The lighter the dichroic, the lighter the cut—and the more contamination you may see in synthetic fabrics and certain dyed fabrics. If the filter does a good enough job then the IR/far red contamination may be hidden by bringing the black levels down to normal in post.

The RED requires filters with a dichroic Hot Mirror. The Tiffen IR ND’s, which DO NOT have a Hot Mirror, work only on the Panavision Genesis and Sony F35. They do NOT work on the RED. The RED requires use of Tiffen’s Hot Mirror IR ND filters, which are (unfortunately) more expensive because of their dichroic coatings.

If a Hot Mirror is not labeled as to which side should face out the front of the matte box, it seems that the salmon-tinted side (when viewed at an off angle) should face out, away from the lens, and the cyan-tinted side (when viewed at an off angle) should face in, toward the lens. Hot Mirrors do have a front and a back, and it’s important that they sit in the matte box the right way.

Stayed tuned for the Sony F35 IR filter test, which should appear on Friday if my shoot schedule doesn’t change dramatically.

Thanks to camera assistant Rod Williams, video engineer Jim Rolin and Videofax for their help in this test. Any errors should be attributed solely to the author.

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Another great article, Art!  I always learn new stuff from your tests.  The Tiffen\Genesis explanation was particularly interesting.

Can you comment on how much these different filters cost?

Looking forward to your F35 IR tests.  Thanks!
-Graham

Posted by Graham Futerfas  on  02/10  at  09:30 PM

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I’m sorry, Graham, I don’t know the pricing. I do know that Tiffen asked me to make it very clear that you don’t need Hot Mirror ND’s for the F35 because they cost a lot more and aren’t necessary on that camera.

I’m quite impressed with what Tiffen has done. I hope to get that article up on Friday. It’s a biggie…

Posted by Art Adams  on  02/10  at  09:54 PM

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Thanks for the comparison tests.  I was sorry not to see the Rosco TruColor IR filter in the mix since I helped Rosco develop it specifically for the RED One.

Best,

Michael

Posted by Michael Morlan  on  02/16  at  11:50 AM

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This is a very informative article. I learned a lot from it. Like the right Hot Mirror filter improve your image quality, does the right ND also improve the Red One image? Like there are reflective ND’s and absorbing ND’s, and what are the quality differences between manufactures?

Kind Regards,

Vincent Visser (The Netherlands)

Posted by .(JavaScript must be enabled to view this email address)  on  08/09  at  11:40 PM

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