Backplate dimples & Re: Mercury Frustration :)

["Anthony W. Maw" <amaw@xxxxxxxxx>]

I have had some nasty experience with dimples on the back pressure plate.  I
ONCE used a Minolta
AF9000 camera with a grid of dimples in the pressure plate.  It didn't
happen regularly, but occasionally the dimples would form a pattern of plus
density spots on HIE film resulting in dark spots on your prints.  It was
very annoying to say the least, unless you're looking for that "special
effect".


- -----Original Message-----
From: Bill D. Casselberry <bcasselb@xxxxxxxxxxx>
To: infrared@xxxxx <infrared@xxxxx>
Date: Wednesday, January 14, 1998 12:23 PM
Subject: Mercury Frustration :)


>
>
>  Anthony posts, in regards to flourescent lighting ...
>
>Flourescent lights work by discharging an electric arc through mercury
>vapour ( inside every flourescent tube is a high vacuum and a small drop of
>mercury).
>
> As a user of older cameras (Spotmatic F & Canonet QL17), this
> is what I find to be so boneheaded about the US regulations
> concerning Hg batteries. When one considers the Hg in all the
> flourescent tubes trashed daily, it seems that the ammount
> from such batteries is miniscule.  Arrrghh !!!
>
> just to keep this somewhat IR oriented  :)  I invite any of
> you to check out my first experiments w/ IR film. I have 4
> images at my site made with the Konica film & my old Voigt-
> lander Bessa II (6x9) out here on the Oregon Coast of the US.
> From the opening page, they are in the Voigtlander section.
>
> I'm eager to try this new fun film in my 35mm system & am bit
> curious how "real" the dimpled pressure plate effect is w/ the
> Kodak HIE. I have heard both ways, so if anyone has definitive
> info as to a Pentax Spotmatic F it woulsd be nice to know. I
> suspect that the Konica may be OK, but the HIE does sound much
> more intriguing  :)
>
> Bill
>
>   ---------------------------------------------------------------------
>
>              for lots of imagry made w/ SpotMatics & prime
>            Pentax/Asahi Takumars and other classic cameras
>            (& some images of some fine older photo-gear) visit ...
>
>            http://www.orednet.org/~bcasselb
>            bcasselb@xxxxxxxxxxx
>    ~75 images at present
>
>                   A Fugitive from the Law of Averages
>
>   ---------------------------------------------------------------------
>
>
>
>
>--
>
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