Re: Infrared dilemma

[Scott Donkin <photos@xxxxxxxxxx>]

At 08:15 PM 10/11/96 +0000, you wrote:
>I've run into a situation that I don't understand.  Using Konica IR rated at
>ISO 32, with a #25 red filter, and a polarizing filter, all of my shots came
>out great.  Now, while using a 20mm lense, the frame corners are all clipped,
>resulting in a round exposure. This only happens with IR film.  Could it be
>that the extra filter at the front of the lense be the problem?  Or has it
>something to do with the thickness of the film? Willard Gill


This is vignetting caused by the thickness of filter(s) you are using.

You'll find that it is more or less pronounced depending on the working
aperture at the time.


Cya...

   ______
   Sco||                E-mail:   photos@xxxxxxxxxx
                       Fidonet:   3:713/914.11

..due to the current economic situation, the light at the end of the tunnel
has been turned off until further notice.


------------------------------

Topic No. 4