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Old Jan 31, 2010, 11:36 AM
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tigar's Avatar
Athens, Greece
Joined Sep 2001
1,168 Posts
Help!
Need lens with ir cut filter

Hi.
I have 2 cameras (one of them is this : http://www.inesun.com/show-3259.html )
I can only use 1 at a time because i am short of lens with ir cut coating. I bought some lenses from Dealexterme but they dont have the ir coating and the colors look washed and the reds look gray .
Any one can post any link to lenses with ''ir cut coating''?
By the way i think the size of the lens is CS mount but i would like someone to confirm.

Thanks
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Old Jan 31, 2010, 01:42 PM
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CabeBedlam's Avatar
Portsmouth, Hampshire
Joined Jan 2010
78 Posts
That's definitely not a CS lens (http://en.wikipedia.org/wiki/C_mount#CS_mount) the focal plane is somewhere behind that camera

The CMOS chip in that camera (and indeed, every other digital camera) will have an IR filter on it, which is why you are finding it hard to get lenses that have additional filtering.

"real" day/night CCTV cameras have a mechanical IR filter plate that moves in and out automatically. Possibly pick up a cheap one from ebay or something and gut it for the filter material and use it in front of the lenses, so as not to mess with the focussing too much.
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Old Jan 31, 2010, 02:54 PM
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Lomcevac's Avatar
Dorset UK
Joined Dec 2006
922 Posts
Quote:
Originally Posted by CabeBedlam View Post
That's definitely not a CS lens (http://en.wikipedia.org/wiki/C_mount#CS_mount) the focal plane is somewhere behind that camera

The CMOS chip in that camera (and indeed, every other digital camera) will have an IR filter on it, which is why you are finding it hard to get lenses that have additional filtering.
Not quite - IR filters are not always on the chip and some CMOS cameras have no IR filtering!
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Old Jan 31, 2010, 03:30 PM
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tty044's Avatar
Joined Aug 2008
370 Posts
Here you can buy it or you may cripple CMOS pinhole lens. It has IR filter in the bottom of the lens.
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Old Jan 31, 2010, 07:32 PM
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CabeBedlam's Avatar
Portsmouth, Hampshire
Joined Jan 2010
78 Posts
Quote:
Originally Posted by Lomcevac View Post
Not quite - IR filters are not always on the chip and some CMOS cameras have no IR filtering!
Much better explanation, Lomcevac

If you want "normal" shots you will need some filter somewhere in the optical chain, otherwise you end up with some really weird images.
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