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Old 16-12-2012, 07:15 PM
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So talk to me about IR mods on DSLR's

Is it a case of removing the low pass filter in front of the sensor and thats it? Can the camera still be used for daylight stuff with some form of screw in filter?
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Old 16-12-2012, 07:32 PM
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Mick,
No not really....
If you remove the colour correcting filter you get better response in the red (ie Ha) and can do a Custom Whitr Banalnce in the camera to "correct"
If you want to go further into the IR then you also need to remove the front dust shake/ anti-alias filter.
There's no easy way of correctng the extended response...there are some $$$$ special filters but not a great choice. I suppose you could add back a UV-IR cut filter then apply a CWB.......
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Old 16-12-2012, 07:44 PM
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its easy to correct the extended responce, both astronomik and maxmax sell the filters needed.

the IR is usually blocked with the same filter that does the color correction, on newer cameras, the low pass and the CC/IRblock are different pieces of glass, older ones, tend to be bonded.

Last edited by technofetishism; 16-12-2012 at 07:56 PM.
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Old 16-12-2012, 07:58 PM
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So if i was looking at a Canon 5D with possible damage to the low pass filter it would still be useful/modifiable if the price was OK.
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Old 16-12-2012, 08:09 PM
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yeah, you could pop out the lowpass and the IR filter at the same time, replace it with either a UV/IR cut or a full spectrum window, then clip in a astronomik OWB eos filter.


only risk you really pull with the removal of the lowpass filter is an increased chance of moire patterns.
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Old 16-12-2012, 08:15 PM
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Rightio, thank you i will keep an eye on it.
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Old 16-12-2012, 08:28 PM
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for examples of whats involved in the mod

http://www.lifepixel.com/tutorials/i...rials/canon-5d
http://www.lifepixel.com/tutorials/i...anon-5d-mk2-ir

sometihng to think about none the less.
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Old 16-12-2012, 09:53 PM
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The attached pdf shows the results of a recent test on the front filter element....
Attached Files
File Type: pdf Canon front filter test.pdf (78.1 KB, 13 views)
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Old 16-12-2012, 11:14 PM
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Thanks guys, well i bought it. 5D for $290 so i will assess it when it gets here and come back and discuss my options.
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