Re: Flash and IR filters and Konica 750

[Clive Warren <Clive.Warren@xxxxxxxxxxxxx>]

At 5:58 pm +0000 27/1/98, Willem-Jan Markerink wrote:

>On 27 Jan 98 at 14:17, Clive Warren 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
>
>Mmm....AFAIK, Hoya does/did not have a #87, only a #89B ("R72", very
>dark red, but not opaque) and a #87A ("RM90", the darkest possible
>color in the Wratten series, but claimed to be outside the range of
>HIE, hence definately not compatible with Konica/Ilford/Agfa).
>
>You most likely used this R72 version, right?
>
>Other than that, #87 is indeed the practial upper limit for Konica,
>#87C is quite a bit darker, and causes excessive long exposures.
>
>For more specific transmission data check my homepage:
>
>http://www.a1.nl/phomepag/markerink/mainpage.htm


I have a Hoya "Infra Red" filter purchased recently after using a 25 for
some time.  The Hoya filter is not made by Hoya, when I get home next I
will have a look at the back of the pack, but I have a feeling it is made
by Tokina....

The filter has no information with it, however it is opaque so I guessed it
to be an 87. It was not cheap, ie around $30, however I would pay double
that to enable me to obtain the two sets of negs I have in my hands now ;-)


Any ideas on the IR flash filter - have you tried this successfully?

Weegee used this method around 40 or 50 years ago to photograph children in
a cinema -  it would be interesting to know what he used over his flash
bulb..



All the best,

              Clive   http://clive.bel-epa.com


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