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Old Jun 05, 2012, 12:18 PM
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For Sale
IR cut filters for cameras

I don't have these yet, but was planning to order a bunch of infrared cut filters for FPV cameras from a Chinese optics company. The trouble is I need to order in batches of 100, and need to know if there is a general interest from FPV people.

These filters are blue glass that filters out most of the infrared light longer than 650 nm. This will improve the color resolution of cameras without filters. The CCD and CMOS detectors are too sensitive to IR light, which is good for nightime viewing, but bad for daylight. Most video and snapshot electronic cameras have such a filter. The filter replaces the glass cover over the detector. These filters are specially made for the purpose, and are similar to those being shipped by some security camera companies for daylight viewing.

If all goes well, I should be able to sell these for just a few dollars each.

Please write me about your interest. If I get positive responses, I will go ahead and order them, and should have them in about a month.

Richard
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Old Jun 05, 2012, 12:40 PM
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Quote:
Originally Posted by rbcodell View Post
I don't have these yet, but was planning to order a bunch of infrared cut filters for FPV cameras from a Chinese optics company. The trouble is I need to order in batches of 100, and need to know if there is a general interest from FPV people.

These filters are blue glass that filters out most of the infrared light longer than 650 nm. This will improve the color resolution of cameras without filters. The CCD and CMOS detectors are too sensitive to IR light, which is good for nightime viewing, but bad for daylight. Most video and snapshot electronic cameras have such a filter. The filter replaces the glass cover over the detector. These filters are specially made for the purpose, and are similar to those being shipped by some security camera companies for daylight viewing.

If all goes well, I should be able to sell these for just a few dollars each.

Please write me about your interest. If I get positive responses, I will go ahead and order them, and should have them in about a month.

Richard
Sounds interesting. I'd be willing to get a couple off of you.
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Old Jun 05, 2012, 01:30 PM
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I'd try one or two out depending on cost
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Old Jun 05, 2012, 02:35 PM
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IR filter

I'll try them. Let us know how much it would cost and how can I fit it to my gopro. Any pics of this?
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Old Jun 05, 2012, 04:54 PM
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me too

count me in for 1-2 depending on cost, been there done that import stuff, wire transfer and such best of luck
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Old Jun 05, 2012, 05:18 PM
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I don't have a good picture. I have a screen capture of the company's products. However, I don't think it would do you any good with the gopro. They already have a good IR filter in those cameras. These are more for the security cameras that don't include filters.
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Old Jun 05, 2012, 05:52 PM
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Very interested - the GoPro IR cut filter is actually on the lens, unlike most of the cheap cameras where the filter is on the sensor.
This filter means you can use any of a number of very cheap lenses on the GoPro instead of the Sunex or the $$GoPro$$ replacement.
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Old Jun 05, 2012, 06:02 PM
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Count me in for a couple!
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Old Jun 05, 2012, 07:03 PM
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OK. That clears it up about the gopro filters. The ones I was going to order are square 9 or 10 mm. I don't know the size of the gopro sensor, and whether this would cover it. I suppose the filter could also be placed on the back of the lens and trimmed down with a grinder if necessary. One of my cameras had the filter placed that way.

So far there has been enough interest that I think I will go ahead with the order. I just didn't want to be stuck with a large number of these filters. Price should be $2-3 each plus a postage stamp for shipping if I got the figures right. I can't get a final cost until I actually order them.
Dick
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Old Jun 05, 2012, 07:10 PM
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Also interested in a couple.

Bob
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Old Jun 05, 2012, 08:08 PM
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Quote:
Originally Posted by rbcodell View Post
I suppose the filter could also be placed on the back of the lens and trimmed down with a grinder if necessary. One of my cameras had the filter placed that way.
Can they make a round size that could be glued the back of the standard lens?
That would really make it versatile, and a whole lot less hassle.
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Old Jun 05, 2012, 08:15 PM
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Like this one:
http://www.optics-online.com/IRC.asp?PN=IRC21-8R
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Old Jun 05, 2012, 08:20 PM
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On the left is a stock GoPro, you can see they use a reflective IR coating on the back lens. I think they want over $100 for it.
The other two lenses cost less than $10 each; the only thing missing is the IR cut filter.

edit: my hunch is that lens coating is a big part of the GoPro secret for vibrant colors.
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Old Jun 06, 2012, 12:50 AM
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Hey there, correction on the GoPro secret... the vibrant colors and crisp edges are the result of a well designed custom optic. The $10 Sunex cheapies just don't compare.

For comparable quality I recommend Edmund Optics "infinite conjugate" M12 lenses and have had good results also from Optitrack's M12 lenses. Unfortunately both are around $100.

The coating you see on the GoPro lens is probably what's known as a "broad spectrum" anti-reflective (A/R) coating which does a good job at letting light in at the specified field of view and rejects it outside. It's probably present on most or all of the optical surfaces in that lens. The surface of each optic will naturally reflect a small percentage of the light incident on it. That small amount of light will bounce around in the optic until it is let out where it wasn't intended to be, causing ghost images and washing out the colors. The A/R coatings keep the light traveling through the system by reducing that natural tendency to reflect incident light.

But I'm intrigued by this IR filter concept. I'd suggest you do a Kickstarter or IndieGoGo project and push it in the community here so you can get an initial order going. Collecting pledges off of a forum is a nightmare PM me for more info if you'd like some guidance.
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Old Jun 06, 2012, 01:17 AM
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You can get the circular filters, but the square ones are much cheaper. I suppose you could grind or cut the square filters to a round shape with a little care. I will experiment with some of the old cover glasses I will remove from the sensors to see how difficult it would be to shape them. The filter I am ordering are 0.7 mm thick.
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