Good progress on this. I presume that we’ll need a full set of such NDs to use in place of the internal filters (since IR contamination is a problem also under daylight).

Posted by .(JavaScript must be enabled to view this email address)  on  05/19  at  08:17 PM

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Ah I need this filter (4 of them, actually) on the job I’m shooting RIGHT NOW!!  In 77mm screw-on, please. 

Posted by Graham Futerfas  on  05/19  at  09:48 PM

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Hi Serena- I haven’t noticed increased IR contamination with the internal filters engaged, which is really odd. I need to contact Sony and ask about that. I should probably also confirm that that’s what I’m seeing and that I’m not completely losing my mind.

The full set of ND’s is a good option with the F35 as there are no internal filters.

Graham- Sorry, not available for another month. :(

Posted by Art Adams  on  05/19  at  10:18 PM

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Hi Art, the same problem of maroon blacks occurs with synthetic materials. Under tungsten IR is a much greater proportion of the lighting (which is where the problem is most often observed), but in daylight the internal NDs are i the optical chain. Daylight IR contamination was evidenced in one of Walt’s early reviews (the black shirt that wasn’t): http://provideocoalition.com/index.php/awilt/story/three_three_letter_cameras_ex1_f23_red/P4/

Posted by .(JavaScript must be enabled to view this email address)  on  05/20  at  12:19 AM

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I meant Adam Wilt!!

Posted by .(JavaScript must be enabled to view this email address)  on  05/20  at  12:20 AM

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Art
You said: “Bad news: It can’t be combined with any ND, because the amount of green dye in the filter has to increase with the strength of the ND”

Does that include the internal ND wheels in the EX cameras?

Posted by .(JavaScript must be enabled to view this email address)  on  05/20  at  05:20 AM

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I don’t think so. In my tests I found that the internal ND doesn’t have any affect on the far red in the image, which has me a bit baffled. I think I need to email Sony and see what’s going on.

Posted by Art Adams  on  05/20  at  08:55 AM

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Does it matter which order the filters are in? For example putting ND in front of the IR filter or putting them behind it?

I’m not sure how all of this works really, but from a stupid laymans point of viewo, if the IR filter cuts out that spectrum of light, then putting the ND filter behind it surely isn’t going to reintroduce it?

As I said though most of this is above me!

Posted by Simon Wyndham  on  05/21  at  11:13 AM

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I’d suggest putting a hot mirror farthest from the lens as it is very reflective.

In this case, though, this filter isn’t a hot mirror and you can’t use it with other ND’s so it’s a moot point. And if you do use ND’s, you need to use IR ND’s—and since they go up to strengths like 2.1 I doubt you’ll need to use more than one very often.

Posted by Art Adams  on  05/21  at  11:58 AM

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Hi Art,

Based on your tests does this mean that we should, in fact, be able to use the internal NDs on the camera and use this filter? I just want to be clear on that as I have tried many solutions and have been waiting for this one.

If the answer is yes then I think a 77mm and a 4 x 5.65 will be on order as soon as it’s made available.

Thanks.

Jem

Posted by jem Schofield  on  05/21  at  12:44 PM

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It seems to work with the internal filters, yes. I don’t know why, because it shouldn’t. I’m trying to get an answer on that one.

Posted by Art Adams  on  05/21  at  12:45 PM

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Great. Thanks.

I know it has not been released yet, but has Tiffen said what this model will be called? They have an IR filter on the site, but I know that’s not the right one.

Posted by jem Schofield  on  05/21  at  05:28 PM

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They could call it the ‘Dye-R’ filter

Sorry, dumb joke.
Thanks, Art!

Posted by Graham Futerfas  on  05/21  at  05:31 PM

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Graham, if you didn’t crack it I’d have to. And my sense of humor has a poor enough reputation already.

Posted by Art Adams  on  05/22  at  09:57 AM

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Jem- No word on what it will be called. Apparently there will be other prototypes coming soon. As soon as I know a brand name I’ll write it up. There’s a lot of demand for this filter so people will need to know what to ask for!

Posted by Art Adams  on  05/22  at  09:58 AM

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Thanks Art!

Posted by jem Schofield  on  05/22  at  10:30 AM

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Any word on when the filters will be available? We could REALLY use these right now.

Thank you!

Posted by Hidalgo  on  08/28  at  07:54 AM

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