I have made some initial tests with my K20D and an Opteka IR filter. The results are disappointing, mostly due to the very long exposure times.
I've posted the results to smugmug.
jfsavage : photos : Infrared- powered by SmugMug
The first image (of a street) was 1/125, f4.0, ISO 100 with visible light, but 30 seconds, f4.0, ISO 800 with IR.
The second image (with water) was 1/30 with visible and 5 minutes with IR (same f-stop and ISO)
Is this typical of what others have seen with an unconverted K20D? I did wonder if the problem was with the cheap Opteka filter.
(Let me know if I should have posted the pictures using a different technique)
I am considering a pure IR camera as well: converted older pentax DSLR, Sony 7x7 with ND filters, Sony H9 with the nightshot switch mod, Fuji IS-1, Converted Canon Gx, etc. Lots of options, none very cheap ;{
Thanks,
Jonathan