Re: Flash and IR filters and Konica 750

[Joshua_Putnam <josh@xxxxxxxxxxxx>]

>According to Konica's technical bulletin No. Tech 015 "Konica Infra-Red 750
>has a sensitivity range from 640 to 820 nm in addition to the intrinsic
>sensitivity range of AgBr 400- 500nm. The peak sensitivity is 750 nm hence
>it's name".

>So the answer seems to be - use HIE :-)   Which is a shame as I was using
>120 konica film on a rangefinder 6 x 7.  Guess I'm going to have to roll my
>own panoramic flash shots....

Haven't tried it yet in my 6x9 rangefinder, but I shot a roll of
Konica 750 in my OM-4 this weekend, having only used HIE before,
and got good exposures using my T-32 flash on manual with an 87
filter.  

I bracketed through a relatively wide range (five stops) and
haven't yet decided which shot looks like the best exposure so I
can figure out a guide number for the filtered flash.  Exposures
range from almost black negatives to almost clear -- definitely
a narrower range/higher contrast than HIE.  But it does work.

- -- 

 Josh@xxxxxxxxxxxx  is  Joshua Putnam / P.O. Box 13220 / Burton, WA 98013
                       "My other bike is a car."                   
                     http://www.wolfenet.com/~josh/
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