Re: Flash and IR filters and Konica 750

[Gary Beasley <beasleyglb@xxxxxxxxxxxxxx>]

At 02:17 PM 1/27/98 +0100, you wrote:
>Dear All,
>
>Well the experiments with 120 Konica 750 IR have been very interesting.  I
>can report superb results with the following:
>
>Hand Held Meter rating at 9 ASA
>Hoya 87 IR filter on lens
>f16   1/4 sec
>
>Process Ilford HC for 6 minutes
>
>
>High contrast, the prints will be black skies, white foliage etc etc.
>Can't wait to print the negs..... had planned to do it today but it'll be a
>couple of weeks now as my current condenser enlarger only goes up to 6 x 6.
>Am thinking about an LPL colour head enlarger as a replacement - anyone
>have experience of this kit?
>
>
>Flash experiments a complete failure:
>
>Rated at 50 ASA
>No filter
>Flash head covered with two sheets of exposed developed Ektachrome
>Used flash guide calculator and flash on auto
>
>Process Ilford HC for 6 minutes
>
>No discerible image on negs - nothing....  which is surprising.  Flash
>fired through the two sheets of film shows a green tinge, thought it would
>be red.
>
>Does anyone have any ideas?
>
You might experiment with cheap black electrical tape lapped on a piece of
mylar or something similar. This stuff acted like an 87 filter on the head
of an infrared meter I was tinkering with a while back.
As far as the flash, take it off auto if you can and calculate your f stop
yourself. Do a wide bracket to find your true guide number for your
filtration. The auto circuit may be totally skewed by the filtering,
especially if it bounces any light back to the eye directly.
>

Gary Beasley
beasleyglb@xxxxxxxxxxxxxx
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