Thanks, Art!
Posted by Graham Futerfas on 03/27 at 08:52 PM
You’re most welcome. If you come across anything interesting while using these, or other, filters, let me know and we’ll add to it.
Posted by Art Adams on 03/27 at 09:16 PM
Thanks from me too!.
Do I understand it right that there are no IR filters for my EX3 except combined with a ND filter? When I have problem with this ir contamination I normally need all the light I can get.
Thanks
Posted by .(JavaScript must be enabled to view this email address) on 03/31 at 07:51 AM
In theory you won’t see IR contamination without using ND because visible light overwhelms the small amount of IR that sneaks through. It’s only when you add ND, and reduce the amount of visible light in relation to IR, that you’ll start to see contamination.
In the case of the EX3 the problem isn’t actually IR, but far red—red on the edge of visible light. For some reason the colorimetry of the camera is especially sensitive to this part of the spectrum, and although the camera’s IR filter cuts at 700nm (which is actually pretty low) ND filters start passing non-visible light at 680nm, so there’s a little gap.
To block that gap Tiffen has apparently found a complementary color that filters far red. It’s a yellow-green, and I haven’t seen a filter using this color that’s not combined with ND. I don’t know why that is. Perhaps it’s because Tiffen is afraid you’ll just buy the one filter and try to use it with everything, which wouldn’t work as you’d need more of the color when working with stronger ND’s—which is why their IR ND’s yellow-green color strengthens proportionate to the ND strength.
Posted by Art Adams on 03/31 at 09:48 AM
I did a shoot with the EX1\EX3 recently, tungsten lit on a stage, and the IR contamination was fairly pronounced. I didn’t notice it during the shoot, but looking at the rushes I definitely see it in some of the polyester wardrobes where there’s a redish tinge. I don’t think anyone else notices it, but it drives me crazy.
Anyway, no ND filters involved, shot at a 2.8/4. I don’t want to shoot with those cameras without an IR filter anymore—of course they need to make a filter that doesn’t have ND with it, preferably in 77mm screw-on style.
Thanks,
-Graham
Posted by Graham Futerfas on 03/31 at 10:28 AM
Yeah, I see it without ND as well. Unfortunately the only non-ND filter that would work would be Schneider’s Tru-Cut 680, but it’s not widely available and it also has a very heavy dichroic coating that vignettes on wide angle lenses.
There does seem to be a need for a “no ND” version of this filter. I haven’t been able to get a response as to why they won’t, or can’t, make one.
Posted by Art Adams on 03/31 at 11:17 AM
Tiffen does sell a no ND IR filter. I just don’t know if it’s the right IR.
Posted by .(JavaScript must be enabled to view this email address) on 04/01 at 07:12 AM
Are there Tiffen Hot Mirror IR ND Filters apropriate for the Red One available in 6.6x6.6?
Posted by .(JavaScript must be enabled to view this email address) on 04/07 at 02:18 PM
Any plans to do similar test with the Rosco Trucolor IR Cut filter?
Posted by .(JavaScript must be enabled to view this email address) on 04/15 at 09:37 AM
Redrock microFilters also:
http://www.redrockmicro.com/microFilters/index.html
Posted by .(JavaScript must be enabled to view this email address) on 04/15 at 09:40 AM
Actually, yes—I’m testing the Rosco Tru-Color IR filter today, at Videofax in San Francisco.
Posted by Art Adams on 04/15 at 09:46 AM
I haven’t heard of the Redrock filter, but then I’ve never used a Redrock. The photo makes it look like quite a heavy filter as you shouldn’t be seeing color shifts as dramatic as you can in that still. Maybe they did that in Photoshop to make it look pretty.
I’m happy to test it if I can round up a Redrock. Or do they advertise that it can be used on anything? I’m wondering if they made the filter to suit a limited angle of view, and I’m not sure what the widest lens is that can be used on their adapter.
Posted by Art Adams on 04/15 at 09:58 AM
I should also mention that I’m testing a Schneider 720-pola combo today as well. It sounds like a winner.
Posted by Art Adams on 04/15 at 09:59 AM
I’m also wondering if Rosco’s filter is still unsandwiched, and if so which is the side with the coating?
I believe it doesn’t matter which side faces forward either.
Posted by .(JavaScript must be enabled to view this email address) on 04/15 at 12:54 PM
The Rosco works well in getting rid of IR issues in both EX & Red cameras. BUT, it also gives green vignette with wide angle lenses. On the red it wasn’t apparent with the 16mm but was noticable on the 14mm and especially on the 10mm. Similar issues on W/A EX-3.
Posted by .(JavaScript must be enabled to view this email address) on 04/15 at 01:52 PM
For your information, Rosco have confirmed the following to a query email I sent:
1)The filter consists of a thin metal film deposit on one side. It is unprotected and not sandwiched behind another layer of glass.
2) The metal film deposit is on the side with the writing.
3) The recommended cleaning method if it gets dust, grease or other marks on it is the regular cleaning methods of any other camera filter, you could use Rosco Lens cleaner and a soft white cloth.
4) Q: How fragile is it really - could I for example use electricians PVC tape to temporarily attach it to a smaller mattebox or hood, and take it off on the film deposit side without it coming off with the tape when I peeled it off?
A: The coating is a fairly hard and durable coating but I would NOT recommend using any kind of tape on the surface of the camera filter
Posted by .(JavaScript must be enabled to view this email address) on 04/17 at 07:54 PM
