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in reply to @kukkurovaca's post:

I'm not DIY enough to do my own conversions, so I just pay to have cameras converted. I've used Lifepixel and Kolari and been happy with the work from both.

Most cameras can be infrared converted, and AFAIK all digital camera sensors are capable of seeing infrared. There are some cameras where infrared doesn't work well under some conditions due to things like IR monitoring LEDs inside the body itself. The GRIII which I'm using here is actually one of those; it can only be used between ISO100-200 without artifacts.

Removing the hot mirror is the main thing. You'll also want some kind of IR pass filter, either installed in place of the hot mirror or just on the lens. For black and white that usually means a 720nm or higher cutoff, give or take. For color infrared there are a variety of options, I've only tried Kolari's "IR Chrome" one.

If the camera has live view and is capable of autofocusing in live view, then autofocus will usually just work.

If it's an SLR without live view, then you need to account for the IR focus shift. Older manual focus lenses often had an IR index for this purpose, but as long as the lens has a DOF scale, you can usually just add a mark if you need to after doing some mildly tedious calibration.