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General photography questions and answers: Discuss IR on D90...Was trying to set a pre-set WB for the R72 filter but camera kept on saying no good no matter ...
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Old 06-07-2012, 21:44   #1 (permalink)
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IR on D90

Was trying to set a pre-set WB for the R72 filter but camera kept on saying no good no matter if it was pointed at grass or sky, don't tell me it dosent do this unless its converted only for IR
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Old 06-07-2012, 22:19   #2 (permalink)
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Re: IR on D90

That is the message you get if the lighting is too light or too dark for the camera to take a measurement. Have you tried doing it in better light?
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Old 06-07-2012, 22:28   #3 (permalink)
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Re: IR on D90

My advice would be to Google "Custom White balance for R72 filter" as I did and you will get a lot of relevant information including some specific information about the D90.

You need to remember that DSLR cameras include a filter above the sensor to remove IR. You then add the R72 which remove all visible light which leaves very little for the sensor. This IR filter is weaker in some cameras so they still have an adequate IR performance albiet with slow shutter speeds. For Nikon, the D70 in particular is more sensitive to IR so has been popular for this purpose but I understand that the D90 has a stronger block so is very difficult to use with an R72 for IR.

I used my Canon 20D with an R72 initially as the 20D did not have a strong blocking filter. However, I found the results most unsatisfactory. The exposures were 30 seconds in bright sunlight so anything that moved such as clouds and foliage were rendered blurred and you had to use a tripod. Furthermore composing the shot is difficult as you cannot see anything with an R72 filter on the camera. In comparison, once I had the 20D modified for IR, it is a joy to use. I can focus, compose and expose normally and see the IR image on the screen. No more need for tripods in bright sunlight.
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Old 07-07-2012, 12:03   #4 (permalink)
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Re: IR on D90

Cheers guys, after finding out a bit about it it can be done but the sensor would not be as good to IR light compared to the D70, eg try f11 @ 30 sec + for preset WB
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Old 07-07-2012, 17:16   #5 (permalink)
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Re: IR on D90

Glad to hear you have discovered a method. I remember when I would get those messages and I use a different camera then you (canon). I decided that I would leave the white balance set to auto on camera then tripod the unit and take a picture of bright green with the 72 on the lens set to AUTO WB. On my camera when you then menu up custom WB it ask you if you want to use a picture. I would scroll to the picture and use it and I never got another message that this couldn't be used. I used to keep certain pictures for the purpose of a preset style usage. Things turned out different when I discovered that I could get a 10 megapixel rebel for 800 dollars less then my 20D cost. I bought my 20D when they first came out, I found it at one store on line. I know Simpbow that money sometimes (all the time) makes our life full of work arounds. I now use my only 72mm lens filter on my 5 mega pixel C5050Z f/1.8 point and shoot on a little home made tripod. Once I had my white balance down, the camera has worked on a par line. My point being is you might find that a point and shoot would serve you better as an IR camera once set to your likeings and never used for anything else. The cost of some very low cost for a good P&S camera or what kind to use is another question. I found this to be the answer if your SLR is a great color shooter and having a set up ready to go is more in line with my budget
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Old 07-07-2012, 18:08   #6 (permalink)
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Re: IR on D90

Now there's a thought Boofers, never really thought about it that way
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