First you need to buy my old Canon 10D.

('Cos it's more sensitive to IR than the 20D/30D.

)
Next... Just put it on a tripod, use a decent lens stopped down a bit to avoid 'hot spots' and have a play. Focus manually - the correct focus won't be quite where the focusing scale shows. Exposure times can be very long.
Or... cheat and spoof it in Photoshop.
