IR 850 Filter - DPChallenge Forums

Canon RF 24-70mm f/2.8 L IS

04/05/2012 07:51:16 PM · #1

I recently bought an IR 850nm Filter for my 18-700 (72mm) lens. When I put it on my lens I see nothing but black? is this supposed to happen? when I take a picture there's nothing but darkness.... i'm confused on how this filter works?

kirbic

Canon EOS R5

04/05/2012 08:14:10 PM · #2

Yep, it's working!
The IR850 means it passes infrared with wavelength longer than about 850nm. That's well above the wavelength of visible red light. Unless your camera has been modified to remove the IR cut filter, you will require very long exposures. It will be possible to get an image, it will just take many seconds to do so, even in bright light.
Focusing must be cone with the filter removed, or by setting with the distance scale.

Olympus OM-D E-M5 Mark III

04/05/2012 08:18:17 PM · #3

Ah kirbic thank you very much!! I had a feeling it was something along those lines.... I saw some pics taken with the filter and there were a lot of cloud trails. Thank you again for the info i'll have to get out and do some long exposures.

GinaRothfels

Olympus 8mm f/1.8 M.Zuiko Digital ED Fisheye PRO Lens

04/05/2012 08:59:44 PM · #4

Originally posted by Maver:

I recently bought an IR 850nm Filter for my 18-700 (72mm) lens.

Interesting lens :)

Sony FE 200-600mm f/5.6-6.3 G OSS

04/05/2012 09:40:58 PM · #5

hahhahhahah GinaRothfels ..... didn't even pick up on that mistake lol... 18-200 is what I meant .... thats what I get for watching creativelive and trying to type!

vawendy

Sony Alpha 1

04/05/2012 09:43:14 PM · #6

Originally posted by GinaRothfels:

Originally posted by Maver:
I recently bought an IR 850nm Filter for my 18-700 (72mm) lens.

Interesting lens :)

whoa... 18-700?? I'd hate to see the price of that lens!

Google Glass Google Glass

04/08/2012 03:48:00 PM · #7

Ok, so I finally figured out the exposure for the IR filter... now my issue is that it's coming out very Purple in color... I know it's supposed to have a color cast but from everything I read it should be red.... also.. i know when you take it into photoshop in the RAW dialogue you use the white balance eye dropper and that helps with the effect.... when I use the White balance eye dropper it just changed my image into a black and white and thats it... the sky doesn't go orange and the leaves on the trees don't go as white as I see in tutorials... ? any ideas on what i'm doing wrong?

ambaker

Canon EF 70-200mm f/2.8L USM

04/08/2012 10:19:01 PM · #8

Do a custom white balance in camera. Take a picture of green grass in the sunlight, with the filtter in place, and have the camera adjust to that.