Mhoganphoto wrote:Why is the IR cut filter required?
Most digital stills cameras and video/cinema cameras have built-in IR filters, but the Blackmagic cameras allow a lot more of the IR spectrum to pass through. This can lead to IR pollution of your image that is very hard to remove in post. Captain Hook (before he started working for Blackmagic Design) developed a LUT that does a good job of fixing it but of course the better approach is to avoid it in the first place. It's not only a problem when you use ND filters; it depends on the light source.
There are basically two solutions:
1) buy an optical low-pass filter, like the one from Rawlite (they may be working on one for the BMPCC 4K; it's currently available for the original Pocket and Micro, and the Ursas).
2) use an IR cut filter on the lens (or use one in your matte box if you use a matte box)
If you have a lot of lenses and don't use a matte box, option 1 is probably the cheaper and simpler solution in the long run, since you won't have to buy IR cut filters for all your lenses, but option 2 is the only one currently for the BMPCC 4K.
UV-IR cut filters are not as cheap as UV filters. My camera store doesn't even carry them and I had to order them. I have a Hoya one for one of my lenses and the others are from Formatt-Hitech in the UK.
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