At 10:12 PM 7/3/03, you wrote:
I think missed part of this thread. Where can I find IR filter material?
Thanks,
Mickey
It's free! Well, almost free.
Next time you shoot a roll of 35mm chrome, keep the black leader that was
exposed to light when you loaded the film. It always gets returned with
the slides. Might require a few rolls to get a hunk big enough.
Transparency film transmits very nearly 100% IR after it's been developed
regardless of how much visible light it does or does not
transmit. Why? It would fry in a slide projector if it didn't (my old
Rollei P11 Dual has a 500 Watt bulb).
The xenon discharge tubes used in electronic flashes put out a fair amount
of IR. How much and how far down into the IR region I don't know. I'm
admittedly a "gear head" but not that much of one to have researched it as
I don't use IR film [yet].
Cover the front of a flash unit with the hunk of completely exposed (and
developed) slide film leader and Bob's Your Uncle, you have an IR
flash. What its GN is in the IR region I have no idea.
Optical slaves are very sensitive to IR, just as they are to visible
light. I simply use a low powered one, set at its lowest power setting, to
trigger optical slaves on monolights in my "makeshift" studio at home. As
I posted before, doesn't work worth a tinker's dam on-location at a wedding
in a cavernous church, but is completely reliable in a more confined one
such as a studio. That's why I referred to it as an old studio trick. An
old grizzled geezer who's been around since before flash bulbs were
invented passed it on to me a number of years ago . . . lest it become part
of the lost craft.
-- John
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|