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

[eml@xxxxxxxxx]

Just a quick note concerning my message about SD-19A.  There is
a film with an EI in the stratosphere which is available to all.
It is Polaroid's 612, with a ridiculous speed of 10,000 0r 20,000.
It's a higher-contrast film intended for ocilloscope cameras.  But 
with a fast lens, like a f: 2.8 or f:3.5 Planar or Xenotar, hand-held,
existing light work AFTER DARK becomes possible with your 4x5 press camera.

Regarding lightmeters, I think even old Gossen Luna Pro's were scaled
that high.  Even my Spectra P-251 has 32,000 on its scale.  40 to 
50 year-old Norwood Director meters (the dies were sold to Sekonic
for the L-398 series thirty years ago, maybe) read to 1,000!  

After all, Kodak 2475 Recording Film, and Kodak Royal-X Pan, both
very old, obsolete films, are rated at 1000 and 1250, respectively,
and that's ASA, not EI.  Kodak 2485 Rapid Access Recording Film was
maybe a stop faster.  Remember, we're talking about 1960's technology,
here. Let's not forgethe 3000 speed standard Polaroid single sheet 4x5
film (type 57) or packfilms (107 and 667).  Modern high-speed emulsions
are no faster, with TMZ having a true speed of maybe 1000.  They are
less fussy, certainly a biut finer-grained, but not faster.

Ed
-- 
    _/_/_/_/ _/_/    _/ _/   | Edward M. Lukacs 
   _/       _/ _/ _/_/ _/    | eml@xxxxxxxxx 
  _/_/_/   _/  _/  _/ _/     | 3850 Tunlaw Road, NW, Apt. 815 
 _/       _/      _/ _/      | Washington, DC 20007
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Topic No. 4