False Color with Hoya R72?

[Fat Buff Guy]

I recently bought one, have not been able to achieve the false color. i get decent images when i change my wb's around but not it color. well, at least not different colors. makes for pretty sweet b&w's. any one have suggestions? ex with this filter?

[Jon]

The R72's not going to let you get "false colour" IR; typical colour IR film captures the green, red and infrared bands. The R72 cuts off everything but IR. To get false colour IR with film, photographers use a Wratten 12 ("Minus Blue") filter. Because of the IR cutoff filter used in most DSLRs, you won't get enough IR exposure on the "blue" pixels to give you a balanced exposure if you shoot with just a Minus Blue filter in place. Your best options if you want false colour are to either get your camera converted by removal of the IR cutoff filter or to shoot two cameras (or successive frames) one with the IR filter and one with a Minus Blue, and combine the two in post.

[Fat Buff Guy]

hey thanks for the intel. good information. I am shooting digital. but i am also looking at getting some IR film. Do you have any suggestions on film?

im not hell bent on the false color, i just thought it would be fun to try. But what your saying w/ film is; if i get the wratten 12 filter i can get that off color look(with IR film)?

[Jon]

With a colour IR film; I don't know what's commercially available in 35 mm these days; I used to use Kodak's E-4 process CIR; they make an E-6-process Ektachrome IR but I don't think it's available in 35 mm format. If it is, you'll still need to be careful as many cameras use IR sensors to monitor film advance and that can fog the film. Also some processors use IR light in monitoring their operations. The preferred processing is really AR-5, not E-6; a closely-related but not identical process. Unless you can find a colour IR film, you'd need to shoot multi-spectral, with multiple cameras with matching lenses, selectively filtered one IR, one red and one green, and scan and combine them in post-processing.