Polaroid Infrared film like 55 P/N?

[Doug Webb]

I would really like to see Polaroid develop a film like 55 P/N but make it an infrared 4x5 film. Wouldn't it be great to see what the print would look like and then make the necessary adjustments to get a recoverable infrared negative that could be enlarged? Anyone think they could talk Polaroid into making something like that?

 

[Sparky]

I'm really not too sure what the spectral response curve of type 55 is... but most B&W Panchromatic films DO tend to be somewhat IR-sensitive. ANY IR-sensitive film of panchromatic design will yield results VERY similar to classic IR emulsions if used with an IR bandpass filter (usually around 680 nm, I think). HOWEVER - I would guess that the emulsion formulated for T55 would be nearly IR insensitive as that would tend to make it fog easily (I assume the paper jackets are somewhat IR-transparent). Do a test shot. Try rating it at ASA 2 or so - with an IR filter and let us know what happens!