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06/10/2007 12:08:57 PM · #1 |
| I was wondering how the Cokin infrared filter performs. I have concerns about it as the filter does not go right up next to the lens with the cokin system. Therefore, I was wondering if light leaks in around the filter, and if the result is a sub par infrared image. |
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06/10/2007 12:25:14 PM · #2 |
| Your concern is spot-on. After a number of wahed out images caused by the light leaking in around the filter, I forced it into the first slot in the Cokin filter holder. That solved the problem, but you have to do it very carefully or you'll scratch (or break) the filter because that slot is meant for the rotating filters in the metal frames (like the polarizer), not the reguar square filters. |
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06/10/2007 12:39:06 PM · #3 |
| Thanks for your help. I guess this means I wont be buying an infrared from Cokin then. It was just going to be a novelty anyways. |
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06/10/2007 05:10:09 PM · #4 |
| Just wanted to point out that the Cokin holder can be rearranged so that the slot closest to the lens is one of the wider ones. No need to force anything. |
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06/10/2007 05:42:43 PM · #5 |
There's also a list of lenses that don't work well with IR. Something about the IR light bouncing around inside and creating ghost circles. My 24mm does this, but my 50mm doesn't.
Actually, it's a hotspot in the center.
Here's a search.
Google Search
Message edited by author 2007-06-10 17:50:27. |
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06/11/2007 07:44:21 AM · #6 |
i have this filter from cokin.
you can get a hood from cokin that fits around the filters to prevent light leaking in from the sides.
also you need to cover the rear eye piece as well for the same reason.
you also need to account for how good your sensor is at blocking IR light. my 20D is too good, and requires exposures of upto a minute in broad daylight.
i don't know how good or bad your 300D is. |
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06/11/2007 11:02:35 AM · #7 |
For the price of the Cokin set-up you can get a gel filter holder and a gel filter. This also allows quick removal of the filter for composing, etc.
 
I also use mine (kenko) when I'm not using a gel as the front has 82mm threads, so one filter can cover all my lenses and allow quick composition changes as I mentioned.
edit to add: Gel filters are usually of a much higher quality than can be obtained with a traditional screw-in or rectangular filter, especially the resin ones like the cokin.
Message edited by author 2007-06-11 11:06:11. |
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06/11/2007 11:11:12 AM · #8 |
I have a cokin IR filter and use it with a cokin hood and a 'snood' I created out of an old sock. I like it for the fact that I can put it on any of my lenses (I have step down rings for all), it's easy to work with (rather than having to screw and unscrew it), and it renders colors beautifully (I have a hoya that gives me too much red). The last few in my portfolio are all using the cokin set-up.
I did notice that my 300D is much better at IR than my 30D so I now use it. Haven't gotten the money together to convert it though... |
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