RE: konica deveopment - or lack thereof

[Goff Photography <jdgoff@xxxxxxxx>]

At 09:18 AM 6/13/97 +0300, you wrote:
>>From: 	Goff Photography[SMTP:jdgoff@xxxxxxxx]
>>Subject: 	Re: konica deveopment - or lack thereof
>>
>>I haven't looked at the transmission curves for the red 29 filter so
>>what follows is generated from my memory---which is increasingly
>>unreliable
>>as I age. But I believe the cut off for the 29 is further out into the
>>red
>>end of the spectrum than the 25. You may wish to compare that curve to
>>the
>>sensitivity of the Konica. The point I driving toward is that by using
>>the
>>29, you may be reducing the 'light' that is in the sensitivity range of
>>and
>>impinges upon the film, thereby causing an underexposure.
>
>I have used sometimes three different red filters, B+W 091 (like #29),
>Hoya 25A (like #25) and Cokin 003 (like #25 ?) on the same roll
>of Konica IR 750. There is no big difference between the negatives
>in density. You can look at the filter tables in WJ's homepage.
>
>Hannu
>>
>*
>**Hannu,  Thanks for this information. As I said, I was not sure about the
effect of the 29 vrs the 25 filter. I have not made tests with the different
filters, so I appreciate your information.  Thanks again...James
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