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08-11-2013, 03:23 PM   #1
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NIR sensitivity of K-5 sensor

People mostly use Hoya 72 type NIR filters for "IR photography". I was quite surprised to see that my K-5's sensitivity to near infra red dramatically increased with use of filters with cutoff point much higher than 720 nm. Below are sample results for IR 950. Tomorrow I will test IR 1000. Second picture shows what is left after in-camera subtraction of cyan and magenta. Other than it I did not postprocess anything. Obviously AF won't work for NIR .Same with prefocusing without filter - due to different refraction angles for NIR.

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08-11-2013, 06:02 PM   #2
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Here's another one with IR 950 filter (front of our house) . I was using crappy 18-55mm kit lens so I realize picture quality is only as good. 72mm IR filters are on order so I will be able to shoot with my Rokinon 85mm f/1.4. I'm expecting much better IQ.
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Last edited by atarget; 08-11-2013 at 07:26 PM.

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