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    In general, you usually start to see IR contamination with ND 1.2+ (besides with cameras that have built-in NDs which also have additional IR control).


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    B+W, Hoya, Firecrest ... the first two variable ... none have much IR Cut worth mentioning.


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    Senior Member Samuel H's Avatar
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    I've used very strong ND filters on my p4k (ND500 and ND64, or 9 and 6 stops - shallow DoF on this m43 sensor often means f/0.95, so, yeah) and never noticed any IR contamination issues. Never looked for them either, though. I'm using Hoya ProND screw-in filters.


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    Senior Member Bern Caughey's Avatar
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    Hoya ProND is my choice for circular IRND filters, & own sets in 58mm, 62mm, 67mm, 72mm, & 77mm. They use ACCU-ND ”electrolytic coating to deposit rare earth metals onto the glass surface to create hyper neutral density filters that have industry-leading virtually zero color shift and IR suppression. The deposit method holds neutrality that is free of color shift over time”.

    https://www.tokinacinemausa.com/tokina-pro-irnd-filters

    The ProND(s) were the darlings of BMCuser at one point because of their IR suppression, & it’s good to hear they appear to work well with the P4K.

    80 page thread on BMCuser
    http://www.bmcuser.com/showthread.ph...-Report-Thread

    There’s no denying the P6K can suffer IR contamination as demonstrated in the that test, & I’m surprised there are not more thorough test available, but that may be due to the camera being so new. I suspect that using a IR filter is best practice even when no ND is attached, just as it is with the Mini Pro, but would love to see a proper test that proves that it’s not.

    PS: ACCU-ND is Hoya/Tokina’s name for this tech, but there are some other companies that use similar metallic coatings.
    Last edited by Bern Caughey; 09-16-2019 at 05:33 AM.


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    Many people don't notice IR pollution (I know I didn't years ago) until you show them (like their blacks side by side).

    I like Firecrests.


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    Senior Member Bern Caughey's Avatar
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    My circular filters larger than 77mm are Firecrest(s), though if I was buying new today they’d be the Tokina ACCU-ND just for consistency across my sets. Also considering Tokina’s square, & rectangular, IRND filters.
    Last edited by Bern Caughey; 09-16-2019 at 06:44 AM.


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    Quote Originally Posted by puredrifting View Post
    The ergos are weird, it would be a PITA to try to rig onto my gimbal.
    Yeah, that I agree with. It's too wide, and I don't see a good reason for that other than to incorporate the monitor with minimum manufacturing costs. I think it's also designed partly to appeal to dSLR users, so maybe it's a BMD's way of enticing people shooting with mirrorless hybrids over?

    it's astoundingly competent for almost no money.
    Can't argue with that!


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    Quote Originally Posted by NorBro View Post
    Many people don't notice IR pollution (I know I didn't years ago) until you show them (like their blacks side by side).

    I like Firecrests.
    The video was not about IR that people hardly notice, it was grotesque and horribly prominent in a way that no one could miss. I want to see someone reproduce that, not innuendo.


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    Don't know which video you're talking about; just saying in general.


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    Quote Originally Posted by Tom Roper View Post
    The video was not about IR that people hardly notice, it was grotesque and horribly prominent in a way that no one could miss. I want to see someone reproduce that, not innuendo.
    They will need to shoot in afternoon sunlight or indoors under tungsten lights, and use plain-jane 4+ stop ND filters with no IR filtering. ( I also use the Hoya Pro ND filters that filter out IR contamination )


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