Thanks - you've given me some ideas, and the effect is very visible
in your example.
BB
On Wed, 21 Jul 1999 21:51:39 -0700, Norma Foltz wrote:
>Barry,
>
>I've experienced that pressure plate dimple effect peculiar to OM
>cameras
>with Kodak High Speed Infrared film. It is particularly bat when you
>are using a strong
>developer like HC110 dilution B. It is hardly noticeable with much
>lower contrast
>developers like Tmax.
>You can see an example of the "dimple effect" on the IR section of my
>web page at
>http://www.netcom.com/~flzhgn/ir.htm
>
>It is very apparent in the upper right hand corner of the Infrared photo
>of clouds from
>38,000 feet.
>
>I've used various things to cover the dimpled back pressure plate and
>all of them have
>worked. I first put a piece of exposed completely black RC photo paper
>over the pressure
>plate with a piece of double stick tape. It worked fine for a few
>years.
>Right now I've got a piece of completely exposed and developed E6 slide
>film leader
>over the pressure plate and this works just fine also.
>The next time I put something in it will be a highly reflective piece of
>aluminized mylar
>"Space Blanket" material because I hope to enhance the so called "Wood"
>effect and
>those ghostly highlights in IR / HIE photography due to the lack of an
>antihalation layer.
>It is analagous to the effect one perceives when ones eyes are dilated
>by contact with
>drugs like scopalamine the anti seasickness remedy that I believe is no
>longer on the US Market.
> I wonder if animal like dogs and cats with that "tapeta lucidum"
>layer in their retinas perceive
>effects like this especially when the pigment epithelium is retracted as
>in dark adaptation.
>The similarities of the eye and the camera just like the retina and film
>are fun to think about.
>Contact me off list if you want to pursue this further.
>
>Hank Hogan <flzhgn@xxxxxxxxxxxxx>
>
>BTW -- I often use my wife Norma Foltz's computer for reading the
>Olympus List.
>
>
>
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-
B.B. Bean - Have horn, will travel
bbbean@xxxxxxxxxxxxxx
Peach Orchard, MO
http://www.beancotton.com/bbbean.shtml
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