Re: EIR antihalation layer (was: Dimpled pressure plates

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

On 13 Jun 97 at 18:03, Joe Berenbaum wrote:

> >On 12 Jun 97 at 20:56, George L Smyth wrote:
> >> Willem-Jan Markerink wrote: 
> >> > As Ektachrome IR provides clear highlights, I assume it has an
> >> > antihalation layer (or is that impossible with slides?), and hence is
> >> > not sensitive to dimpled pressure plates.
> >> 
> >> EIR does not have an antihalation layer, unlike its predecessor.
> 
> In the light of that, I need to know; does this affect the use of 
> Infrared Ektachrome (new type) in Olympus SLRs? Has anyone tried this
> film/camera combination?

I forgot how EIR was 'layered'....if the IR layer is first, the 
second and third layer could absorb all remaining IR (or any other 
light), and none would reflect from the pressure plate at all.
 
> It wouldn't matter, but I have a lens I want to use with this film in
> Olympus mount. Its a Sigma 8mm circular fisheye so it's not like I can 
> just nip down to the store and buy one in another mount! 

Did the Leica conversion not work out?

Btw, just to get you in the mood: I just finished a bunch of new IR
pictures on my homepage, from last winter, amoung which a few taken
with the 8mm Sigma:

http://www.a1.nl/phomepag/markerink/mainpage.htm

All using a #87C between the film rails.

Question for Olympus users, on behalf of Joe: how 'tall' are the
film rails in the Olympus cameras, and do they have a very slight
notch on top and bottom, to seal a filter laying between the rails? 

The 8mm was for me the reason to go ahead with this filter system,
as any color darker than #25 (clear, yellow, orange and red glass
filters are included) is almost impossible to mount, and being an
internal screw filter, very inconvenient to use.


- -- 
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'!]
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