Re: Flash and IR filters and Konica 750

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

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




- -- 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]
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