Re: Minolta 500si and vignetting

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

On 18 Aug 98 at 23:01, David J. Carlyon wrote:

> I have a Minolta 500si, and when I shoot Konica IR film, I have no problem,
> but with the more sensitive Kodak HIE, I get vignetting along the bottom of
> the images (see
> http://scc.net/~david/Photography/Animals/choochoo-and-candy.html and
> http://scc.net/~david/Photography/Animals/grazing.html and
> http://scc.net/~david/Photography/Animals/grazing2.html for examples). I
> took cut a piece of black plastic liner used for photo paper, and used it
> to cover the window over the film cartridge, but the vignetting is still
> there. Might that plastic leak IR light? Or is it more likely due to a leak
> elsewhere (I don't see any other obvious culprits), or maybe IR focusing?

IR-leaking film-windows is an urban myth, they don't exist....the 
origin of this myth is the fact that film *counter* windows on old 
120 format folder cameras fog any film that isn't shielded by a paper 
backing (220!).
However, the entry-models Minolta are known to have the same IR-LED 
film counter (instead of a mechanical sprocket) as nearly all EOS 
bodies. See my homepage for a chapter on this subject, URL in the 
admin footer below.

 

- --                 
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'!]
*
****
*******
******************************************************
*  To remove yourself from this list, send:          *
*         UNSUBSCRIBE INFRARED                       *
*       to                                           *
*         MAJORDOMO@xxxxx                            *
*----------------------------------------------------*
*   For the IR-FAQ, IR-Gallery and heaps of links:   *
*  http://www.a1.nl/phomepag/markerink/mainpage.htm  *
******************************************************

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