IR 760 filter - rating film speed

[JayJayOkocha]

i have the same filters (Green L 760 and 720) so far I got acceptable results using the 720 with Rollei IR 400 at an ASA between 3 and 6. I did not get any acceptable results with the IR760 filter yet but never tried beyond ASA3. Did you get any acceptable results with the IR760?

[Tom Monego]

In theory a DSLR sensor cannot see infrared because a NIR blocking filter is installed, the right exposure with a DSLR and a 760 filter won't give a clue about what exposure is required with Rollei 400 IR film because different practical factors are involved, with DSLR exposure depends on how good/bad is the NIR blocking, with Rollei 400 IR it depends on remaining sensitivity at +760nm.

The M8 doesn't have the IR blocking filter, in fact when not using IR it is best to have an IR/UV blocking filter on the camera. Leica supplied them on request to those who bought the M8 new. Always liked a rangefinder camera with IR.

[Pere Casals]

The M8 doesn't have the IR blocking filter, in fact when not using IR it is best to have an IR/UV blocking filter on the camera. Leica supplied them on request to those who bought the M8 new. Always liked a rangefinder camera with IR.

Tom, the M8 has an IR/UV blocking filter, very thin, it is less effective in the deep reds that usual and a IR/UV blocking filter on lens may be suitable in certain conditions, but think that if the M8 not had the cut-off filter then images would be totally weird for regular photography.

Compare the M8 spectral response with the KAF-10500 CCD sensor, and you will see what the UV/IR blocking filter does.