Re: Advice/bio

[Clive Warren <cocam@xxxxxxxxxxxxxxx>]

>Date: Wed, 11 Oct 2000 17:18:01 CDT
>From: "Keith Zimmerman" <zz_ir@xxxxxxxxxxx>
>Subject: Re: Advice/bio
>
>  >From: Colin McKie <colinmckie@xxxxxxxxxx>
>  >Subject: Re: Advice/bio
>  >
>  >Jessie Harris wrote:
>  > >
>  > > Hello all,
>  > >
>  > > I'm a student photographer who has been happily shooting pictures with
>  >her
>  > > K1000 until she heard that she may not be able to use infrared with
>  > > it.
>
>  >Hi Jessie,
>  >
>  >The only problem you may have with a K1000 is in seeing an image of the
>  >dimpled pressure plate on your film, reported by some users although I
snip
>
>All my IR photos have been done with Konica and I have never experienced a
>problem related to the camera.  I plan to use test the dimpled pressure
>plate with Kodak HIE because I will only believe there is a problem if and
>only if I experience it.
>
>Good luck and enjoy the ride.
>
>Keith Zimmerman


Keith,

You'll have no problems with Konica and dimpled pressure plates as 
Konica has an anti-halation backing to the film.

HIE on the other hand does not have an ant-halation backing and 
infrared light is reflected back from the pressure plate. This is one 
of the causes of the "halo effect". Try out HIE with a dimpled 
pressure plate and look in areas of constant tone on the negs or the 
print  - you'll see the dimples :-)

The simple expedient of wrapping 120 backing paper around the 
pressure plate, black side towards the lens, will stop the problem. 
Some people advocate the use of black self adhesive plastic as a 
longer term solution.



-- 
All the best,

             Clive    http://www.cocam.co.uk
                      Photographic Services, Filters and Equipment, Infrared FAQ
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