April 5th, 2008, 03:19 AM | #91 | |
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Also, I believe Sean is right - we should all complain to Sony about the red problem; realy don't see a reason for $200 expenditure and hassle with additional filter just to get right colours from a CineAlta, "professional" camera...
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April 5th, 2008, 07:55 AM | #92 | |
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Don Deignan |
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April 5th, 2008, 09:39 AM | #93 |
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that sounds different. This problem is really only visible on black subjects with certain dyes in them that reflect IR light. Sounds like a processing problem, although I don't think it's related to this. It does seem like it is a processing problem, and we should start a new thread about it so as not to hijack this one.
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April 8th, 2008, 06:07 AM | #94 | |
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Brian - or anyone else - does this filter fit under the EX1 hood? I would prefer it to the slimline version as I can attach things to the external thread if necessary. I know that the slimline version does fit.
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April 8th, 2008, 06:22 AM | #95 |
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I ended up buying the B+W 489 instead of the 486 as the 486 did not work with 35mm adapters because it has to reflect the light back and it would be behind the adapter. The 489 absorbs it instead of reflecting it and it works great with the Mini35 for example.
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April 8th, 2008, 06:30 AM | #96 |
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Michael,
Does the 489 fit under the hood, and does it have a thread on the outside?
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April 8th, 2008, 11:38 AM | #97 |
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April 9th, 2008, 03:18 AM | #98 | |
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April 9th, 2008, 05:10 AM | #99 |
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there is so many glass in a mini35 adapter , i doubt a filter would still be necessary.
imagine that you add , the lens, the gg screen, the condenser, the macro lens. and you still need to go through the camera lens. |
April 9th, 2008, 05:23 AM | #100 |
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And yet, even with the Letus and a 50mm Canon lense, the black clothes are still brownish when shot in artificial light.
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April 9th, 2008, 07:08 AM | #101 |
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IR passes through many things that visible light does not. The 1 1/2 stops of light loss from the mini35 doesn't really matter, this problem is seen with the RED camera when using heavy ND's like 1.5 and 1.8 (5 and 6 stops!). I used to shoot infrared ektrachrome, and I'd use an opaque filter which blocked all visible light and only transmitted infrared. As far as the 486 behind or in front of the adapter, I'm thinking it doesn't matter. First off, the 486 doesn't reflect the IR light outward like a mirror, it dissipates it between the layers of the filter coating. Also, even if it did reflect the light, why should that matter? The camera won't see it anyway, the filter still blocks it even if it's not traveling straight in. The amount of IR and wavelength we're talking about isn't like a heat lamp, so you won't melt your lens. Later this week I'm going to try a 486 with a mini 35 and cooke S4's. I'll keep everyone informed.
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April 9th, 2008, 07:53 AM | #102 |
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That's why we buy matte boxes. They might seem expensive but compared to a set of screw on filters for every lens thread they start to become cheap.
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April 11th, 2008, 10:34 AM | #103 |
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The 486 filter does work to solve the problem, but it really shouldn't have to be there. I ran into a situation today where I needed the filter, but also a wide angle adapter. Even if I could find a filter in the approriate size, the wide angle doesn't have threads, and I can't put it behind since it mounts to the bayonet. In this case I wouldn't be able to do the shot. I spoke to someone named Lou at Sony support again today, to express my displeasure in the camera not performing as it should. He said he had heard of this earlier in the week from someone who saw it only in certain lighting conditions. He sounded genuinely concerned about the problem and said he would have the engineering team investigate at the beginning of next week. I referred him to this thread, but I think if we all call and complain maybe we can force Sony to step up and fix this. I don't like having to put extra glass in front of the lens.
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April 16th, 2008, 06:21 AM | #104 |
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B&W 486 works fine, when you put it directly on the cameralens there is only a very very slight green coloring of the extreme corners when you zoom out all the way.
The Heliopan UV/IR cut filters give a greenish cast all over the frame and even more so in the corners when zoomed out. |
April 16th, 2008, 06:57 AM | #105 |
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Peter, while the 486 does work fine and I haven't seen any green cast (unlike the 489) I still maintain that it shouldn't have to be there. This is a design problem. A lot of companies use a weaker IR filter to increase sensitivity, but just like they did with a batch of F23's, Sony used one that allows a couple of wavelengths to pass that shouldn't.
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