SD-19A (was: Kodak Hie Dev.)

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

On 22 Sep 96 at 2:30, eml@xxxxxxxxx wrote:

> In SD-19, Kodak Tri-X 35mm film produced a real Exposure Index of
> either 3200 or 6400, I forget which!  The speed winner at that
> time was High Speed Ektachrome (ASA400 normally), which with processing
> in, I think, one of the Perfection developers, produced auseable
> shadow speed, according to the book, of 20,000!

Ok, I'll bite: is there any light meter on which this EI can be set?
A lot of people might think this kind of EI isn't practical, but it
could be interesting for using very dark IR filters like #87B
and #87A, and/or hand holding long teles with opaque filters in
general.

Before you jump on me that _hand holding_ long teles and opaque
filters don't mix very well: I am close to implementing the perfect
filter solution for an SLR....mounting a filter between the film
rails. The honor for this solution goes to Andy Davidhazy, since I
first read about it in one of his IR-FAQ's. Obviously,
gelatine/polyester is too fragile for this application (not per se,
but with darkloading it definately is), and normal glass/resin
filters are to thick (and hard to cut). But a few days ago I
received #87C in a different material from my manufacturer; thin,
flexible, easy to cut, yet far less fragile than gelatine/polyester.

Although I intended to use this material for flash applications (as I
said in earlier postings), the actual between-the-film-rail solution
was provoked by my fisheye lenses; the Russky 16/2.8 has rear screw
filters, the Sigma 8/4 uses internal screw filters. Both are a rather
odd filter size, and require very thin glass as well; no such thing
from any filter manufacturer. So I needed a homebrew solution....but
that would still require a lot of hassle in changing the filter
between composing/focusing and the actual exposure. I also pondered
about using one of these spy-glass contraptions that are used in
doors, as a 180 degree viewfinder, but mounting a filter behind the
mirror, between the film rails seems an even better way to go with
this new #87C material.

The only thing I need now is an absolutely clean type of tape, so
that I can remove it without leaving a sticky substance inside the
camera....8-))

 
> If I can ever find the %#$&@# thing, I'll report the correct
> title and publication date, as well as the SD-19A formula.

Does it help if I say you *MUST* find this publication?!?....8-)) 
Any help from other members?

--
Bye,

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      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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Topic No. 2