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Jimi3 wrote:
I had a 5d mark ii that was converted to IR, and I simply couldnt reach infinity focus with that camera and my old sigma 12-24. Seems strange given that I've always been told that infrared light focuses closer than visible, but it just wouldn't quite get there. I eventually had to get a 12-24ii that WOULD focus on infinity. Hope this isn't a similar case with your lenses.
I am using the same IR-converted 5D MkII camera, but I never ran into this problem. And yes, focusing in IR light should always be closer then visible, so you wouldn't need to go to the lens' infinity mark or certainly not above it. Did you try to focus manually by using LiveView, or did you rely on AF? An IR-converted AF system is normally re-calibrated with a 50 mm lens by the company which did the conversion. There can be AF offsets in the wider or longer focal lengths.
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