Where to get that IR lens

Tolu · 23rd July 2007, 08:18 PM

Hi

I googlin' like a mad wizard and can find nothing.

Who can help to find a supplier or link for that part (red arrow)?

Regards

Thomas

Geek · 23rd July 2007, 09:01 PM

Hi,

Is that a lens or just a filtering window?

If the latter, there's some deep red cellophane sheets at a hobby store that will do well.

Cheers!

Tolu · 23rd July 2007, 11:13 PM

Some are lenses, some are filters, but please no hobby-take-your-knife-and-make-an-ir-lens-out-of-a-flashlight-solutions!

Geek · 24th July 2007, 01:39 AM

Sorry, it was an honest solution known to work

Magura · 24th July 2007, 01:44 AM

Machine a piece of red acrylic sheet. It's a tried and tested solution. You can get red acrylic sheet in just about any dimension you'd care to dream of, at your local ad-sign manufacturer....and he may even machine it for you for a six-pack

EDIT: this is how they got the ones in your pic

Magura

Tolu · 24th July 2007, 09:46 AM

@Geek

Don't be cross with me but I was looking for an easy-buy-solution of a professional supplier.
I think Mr. Creek doesn't go to the hobby store, too.

@Magura

I have seen that Röhm has some red translucent Plexiglass. That was my second solution to mill it. I thought there is e.g. a little company in the world that will produce it for the worlds' demand.

Regards

Thomas

PigletsDad · 24th July 2007, 10:12 AM

Which IR band are you interested in?

Different materials are transparent in different bands. Melles Griot are an optics company who I remember from my physics past, and I think they list some parts in exotic materials.

If you want near IR (800nm to 1um) then conventional optical glass is fully transparent, and the focal length will only be marginally different to the visible; depending on application you may need to add a filter to block the visible band.

Again Melles Griot would be worth checking for stuff like that.

OzMikeH · 24th July 2007, 12:38 PM

the exposed and processed leader from colour 35mm negative film is transparent to infra red and opaque to visible light. a good filter but not very strong.

rabbitz · 24th July 2007, 12:46 PM

I use the red part from a 3M gel filled crimp connector. Pops out, remove the metal piece and goo. Just have to add a hole to the panel (I think about 10mm) and put it in. Works a treat and have done several.

These are the connectors and the pic shows it in a panel for an IR.

imix500 · 24th July 2007, 12:49 PM

Also give Edmund Scientific a look. They carry all kinds of filters/lenses.
http://www.edmundoptics.com

24th July 2007, 01:44 AM	#5
Magura diyAudio Member Join Date: Oct 2003 Location: Denmark, Viborg	Machine a piece of red acrylic sheet. It's a tried and tested solution. You can get red acrylic sheet in just about any dimension you'd care to dream of, at your local ad-sign manufacturer....and he may even machine it for you for a six-pack EDIT: this is how they got the ones in your pic Magura __________________ Everything is possible....to do the impossible just takes a little while longer. www.class-a-labs.com

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23rd July 2007, 09:01 PM	#2
Geek diyAudio Member Join Date: Sep 2004	Hi, Is that a lens or just a filtering window? If the latter, there's some deep red cellophane sheets at a hobby store that will do well. Cheers!

23rd July 2007, 11:13 PM	#3
Tolu diyAudio Member Join Date: Mar 2007	Some are lenses, some are filters, but please no hobby-take-your-knife-and-make-an-ir-lens-out-of-a-flashlight-solutions!

24th July 2007, 01:39 AM	#4
Geek diyAudio Member Join Date: Sep 2004	Sorry, it was an honest solution known to work

24th July 2007, 09:46 AM	#6
Tolu diyAudio Member Join Date: Mar 2007	@Geek Don't be cross with me but I was looking for an easy-buy-solution of a professional supplier. I think Mr. Creek doesn't go to the hobby store, too. @Magura I have seen that Röhm has some red translucent Plexiglass. That was my second solution to mill it. I thought there is e.g. a little company in the world that will produce it for the worlds' demand. Regards Thomas

24th July 2007, 10:12 AM	#7
PigletsDad diyAudio Member Join Date: Jul 2007 Location: South Worcestershire	Which IR band are you interested in? Different materials are transparent in different bands. Melles Griot are an optics company who I remember from my physics past, and I think they list some parts in exotic materials. If you want near IR (800nm to 1um) then conventional optical glass is fully transparent, and the focal length will only be marginally different to the visible; depending on application you may need to add a filter to block the visible band. Again Melles Griot would be worth checking for stuff like that.

24th July 2007, 12:38 PM	#8
OzMikeH diyAudio Member Join Date: Mar 2007	the exposed and processed leader from colour 35mm negative film is transparent to infra red and opaque to visible light. a good filter but not very strong.

24th July 2007, 12:49 PM	#10
imix500 Proud Union Member diyAudio Member Join Date: Mar 2004 Location: Putnam, NY	Also give Edmund Scientific a look. They carry all kinds of filters/lenses. http://www.edmundoptics.com

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