IR Filtration BMCC & Ursa Mini 46k

Hi,

I am a new owner of BMCC (M4/3 + Speedbooster), with Ursa Mini 46k on the way.

I am just transitioning from DSLR film making, and want to know what would be the most popular solution of IR Filtration for my new blackmagic cameras?

I already have a collection of VariND and ND filters, and am just looking for a 4x4 IR filter for matte box.

I've read some posts on this forum about IR+ND, but I just need IR filtration for BMD sensors.

Is the Schneider Optics True Cut 680 a good option for both 25k and 46k sensors?

Many thanks in advance for any help and/or experience you can provide.

Cheers,
Alex

Yes. The Schneider optics 680 is amazing and works like a champ!

Thanks James, What would you recommend for a screw on option?

So I take it the 4.6k sensor still needs IR filtration? That was something I was wondering about.

Most digital cameras need IR filtration. The sensor, even in BM cameras, include IR filters BUT they Bari in strength.

BM have been using very low IR filtration strengths that are fine under normal conditions until you alter the IR:Visible ratio (by adding ND).

Generally it's a good idea to use IR ND on mist cameras.

If you are looking for Screw in options that work well with the BM cameras then the Hoya UV/IR Cut filter is pretty good and so used with the Hoya Pro ND give very neutral results.

Firecast ND from Formatt-Hitech are available in screw, 4x4 & 4x5 and work very well.

I already have a decent collection of NDs, but I am thinking for run and gun I would need a screw on + a variable ND.

Do the Hoyas offer sufficient filtration at higher NDs? From what I've read the 680 is the strongest.

The SLR Magic 77mm Vari-ND has seen positive reviews and there's an improved version that includes control of the polarization effect. Will soon be available in 82mm as well. That's what I intend to use initially.


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I already have a decent collection of NDs, but I am thinking for run and gun I would need a screw on + a variable ND.

Do the Hoyas offer sufficient filtration at higher NDs? From what I've read the 680 is the strongest.

I've been using the Hoya IR Cut with variable ND without any issues. There is a little colour shift especially when using higher settings. Variable ND's do tend to change skin tones so the colour **** you might see is not IR related but rather from polarised light (light reflecting from below the skin kets cut by the polariser).

Most digital cameras need IR filtration. The sensor, even in BM cameras, include IR filters BUT they Bari in strength.

BM have been using very low IR filtration strengths that are fine under normal conditions until you alter the IR:Visible ratio (by adding ND).

Generally it's a good idea to use IR ND on mist cameras.

If you are looking for Screw in options that work well with the BM cameras then the Hoya UV/IR Cut filter is pretty good and so used with the Hoya Pro ND give very neutral results.

Firecast ND from Formatt-Hitech are available in screw, 4x4 & 4x5 and work very well.

Hi, I can not imagine how two filters without 'Screw' options put together with my lens. I would like to ask you if it is possible to put my Hoya Pro ND filter with my sigma 18-35 lens at first, then the Hoya IR/UV on that Hoya ND filter? If this setup cause any vignetting, is there any way to overcome that? I really appreciate your help. Thanks your very much.

Hoya ir screw on


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From my testing the URSA Mini is far more prone to IR contamination than the Pro. The internal ND filters are pretty efficient in blocking IR too.

But for the older one I'd always use additional filtration. If the variable ND filters affect skin appearance negatively that might also be influenced by their polarizing effect.

Most digital cameras need IR filtration. The sensor, even in BM cameras, include IR filters BUT they Bari in strength.

BM have been using very low IR filtration strengths that are fine under normal conditions until you alter the IR:Visible ratio (by adding ND).

Generally it's a good idea to use IR ND on mist cameras.

If you are looking for Screw in options that work well with the BM cameras then the Hoya UV/IR Cut filter is pretty good and so used with the Hoya Pro ND give very neutral results.

Firecast ND from Formatt-Hitech are available in screw, 4x4 & 4x5 and work very well.

Hi, I can not imagine how two filters without 'Screw' options put together with my lens. I would like to ask you if it is possible to put my Hoya Pro ND filter with my sigma 18-35 lens at first, then the Hoya IR/UV on that Hoya ND filter? If this setup cause any vignetting, is there any way to overcome that? I really appreciate your help. Thanks your very much.

I have the Sigma Art 18-35 and the 50-100, so I bought the 82mm filters and use an adapter to run them on the smaller 18-35mm. I have a Hoya IR filter first, then my Hoya ND filter. I haven't noticed any vignetting on the 18-35 (obviously, the filters are bigger than the front element) and I also haven't noticed any on the 50-100.

Hoya ir screw on

Thanks James. Just ordered one.
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Most digital cameras need IR filtration. The sensor, even in BM cameras, include IR filters BUT they Bari in strength.

BM have been using very low IR filtration strengths that are fine under normal conditions until you alter the IR:Visible ratio (by adding ND).

Generally it's a good idea to use IR ND on mist cameras.

If you are looking for Screw in options that work well with the BM cameras then the Hoya UV/IR Cut filter is pretty good and so used with the Hoya Pro ND give very neutral results.

Firecast ND from Formatt-Hitech are available in screw, 4x4 & 4x5 and work very well.

Hi, I can not imagine how two filters without 'Screw' options put together with my lens. I would like to ask you if it is possible to put my Hoya Pro ND filter with my sigma 18-35 lens at first, then the Hoya IR/UV on that Hoya ND filter? If this setup cause any vignetting, is there any way to overcome that? I really appreciate your help. Thanks your very much.

I have the Sigma Art 18-35 and the 50-100, so I bought the 82mm filters and use an adapter to run them on the smaller 18-35mm. I have a Hoya IR filter first, then my Hoya ND filter. I haven't noticed any vignetting on the 18-35 (obviously, the filters are bigger than the front element) and I also haven't noticed any on the 50-100.

Thanks Nate Follmer. Do you suggest to put IR filter on top of ND filter (or the other way around) so the light can hit the IR filter first)?

I honestly couldn't tell the difference when I switched the order, so I put the IR filter first, then ND, then the lens. I haven't found any information regarding order, so I can't say that's the right way to do it, but it hasn't failed me yet

I honestly couldn't tell the difference when I switched the order, so I put the IR filter first, then ND, then the lens. I haven't found any information regarding order, so I can't say that's the right way to do it, but it hasn't failed me yet

Thank you very much Nate.