Re: E-6 as IR filter ??

[Andrew Davidhazy <ANDPPH@xxxxxxxxxxxxxxxxxx>]

Bill,

> 	:)  oops    anyway ; I have seen several folks write of
> 	using unexposed, but developed E-6 film as a filter. Not
> 	quite the same as the "real" ones, but said to be more IR-ish
> 	than a #25 red. I keep meaning to get some of the gels that
> 	WJ has, but haven't yet. In any case ; I was thinking of trying
> 	the E-6 between the rails w/ the next roll I load. Either I
> 	lost any EI info given or something ; so if anyone has determined
> 	a useful EI for this, I would like to have a "ballpark figure"
> 	to start from.

As the divulger/promulgator of this particular solution to dealing with not
having easy access to Wratten IR filters, I take a bit of an exception with
what is starting to become "urban folklore" and misconceptions.

First, the spectral transmission of dye based photographic materials when at
maximum density leaves a lot to be desired in terms of performance
particularly as it pertains to minimum density and also in terms loss of
optical resolution and finally in terms of sharpness of cutoff.

None of this negates the possibility that the "look" may be "more IR-ish" but
those are subjective and not objective terms.

Finally, as the self-appointed "inventor" of the technique of placing filters
between the film plane rails of cameras, I would definitely NOT recommend that
you try placing the E-6 material between the film plane rails of your camera
since the likelihood of preventing the free movement of the film will probably
be adversely affected. This is not so much the case when you use very thin
Wratten filters or similar foil filters but E-6 films are significantly thicker
(usually). In any case, I would carefully test the procedure first and not
unduly force the wind and rewind leversin your camera ... and if all you have
is motor driven advance and rewind ... well, then I'd be even more careful.

regards,

Andy  o o  0 0 o . o  Andrew Davidhazy, Imaging and Photo Tech at RIT
       \/\/\/\/\/\/   http://www.rit.edu/~andpph         716-475-2592  
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