In rec.photo.digital Pat wrote:

| There are some good step-by-step instruction out there for removing
| the filter. You can leave the filter off, but IIRC you need to
| replace it with small shims to keep everything in place.
|
| If you use a IR filter, you then have to have extraordinary long
| exposures because you still have the IR filter in place taking out
| most of the IR.
|
| The other option is to just buy the right camera, something like the
| old Canon EOS 20Da. The "a" designates it as a astronomy camera and
| it doesn't have the filter. I think it's been discontinued but you
| can probably find one if you sniff around.
|
| If you go IR, you might also want to buy an older lens. Some of the
| older ones had an IR mark on the focus ring so you could adjust the IR
| focus (which isn't the same as the visible light focus).

Or you can pay someone else to do the conversion for you:

http://www.lifepixel.com/
http://www.spencerscamera.com/

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