Infrared - A mad question.

With regard to IR work - Does anyone know of a filter that will block all normal light, just leaving the IR range of light frequencies??

Vulcan58 wrote in post #5250693
With regard to IR work - Does anyone know of a filter that will block all normal light, just leaving the IR range of light frequencies??

A (very) incomplete list follows. You will find dozens of posts here which can help you. You'll probably getter a better answer if you advise which camera you are intending to use and also the 'type' of infrared image you are trying to achieve (false colour, B&W etc)

Anyway:
Hoya R70: 700nm;
Hoya R72: 720nm;
Wratten #88A (Heliopan 5715): ~710nm
Hoya R76: 760nm;
Wratten #87 (Heliopan 5780): 740nm
Hoya R80: 800nm;
B+W Infrared 093 (Wratten #87C / Heliopan 5830 / RG 830): min. wavelength 800nm
Hoya R83: 830nm
Hoya R85: 850nm
Hoya RM86: 860nm
Hoya RM90: 900nm
Wratten #87A (B+W 094 / Heliopan 5100 / RG 1000):
min. wavelength 880nm; 50% transmission at 1000nm
Hoya RM100: 1000nm

Thanks Mods for moving this to the correct forum.
Thankyou for the reply /advice wnelson - this wasn't actually for me, but for a colleague of mine who was making general enquiries about IR, and I just mentioned that if I could find an answer it would be on here - ever helpful forum.
Cheers
V58

Vulcan58 wrote in post #5251107
Thanks Mods for moving this to the correct forum.
Thankyou for the reply /advice wnelson - this wasn't actually for me, but for a colleague of mine who was making general enquiries about IR, and I just mentioned that if I could find an answer it would be on here - ever helpful forum.
Cheers
V58

No problem - just warn him that if he uses an external filter on the camera, his exposures are going to be *very* long, he won't be able to see much (if anything) through the viewfinder and will have to make manual focus adjustments.

Don't want to put the person off - it is well worth while. But make him aware.
Lots and lots of info on here about it.

lifepixel.com

Vulcan58 wrote in post #5250693
With regard to IR work - Does anyone know of a filter that will block all normal light, just leaving the IR range of light frequencies??

Good answers above...

Like one poster said...front mounted filter...long exposures, tripod and no framing in the view finder...unless you like to frame without the filter, on the tripod, screw the filter on, MLU, remote shutter trip....for each and every shot.
A cheaper way to address the black view in the viewfinder with the filter mounted...is to buy a cheap throw away camera. Rip out the viewfinder elements and glue them onto a shoe mount platform. You can then frame using that setup mounted on the cameras hotshoe.

Another poster mentioned Lifepixel.com for conversions
I used Jim Chen for a conversion and am very happy.
If your friend is interested in Astro shooting and wants a dedicated conversion with a "custom" IR filter replacment in front of the sensor that is geared towards nebulae emissions etc.....try Hutech.

-rang