by Peter <pirwin@[EMAIL PROTECTED]
>
Nov 1, 2007 at 09:49 PM
On Nov 1, 8:48 pm, Peter Irwin <pir...@[EMAIL PROTECTED]
> wrote:
> Note that the inertia based Weston speed also tracked
> pretty well with the Jones Kodak Speed and Old ASA.
> The normal relation****p would be that Weston 40
> equaled Kodak 200 and Old ASA 50. Many films
> seem to have fit that relation****p perfectly
> and I'm unaware of any that were more than
> 1/3 stop off.
I was wrong about this. I looked up official Weston
speeds from 1940 and compared them to Kodak speeds
from 1943 - and they just aren't always that close.
The Weston speed system was ok, but it
wasn't that good. Weston speeds quoted by Kodak
in the 1943 book are just converted Kodak speeds
- so of course those match.
> Old DIN (1936)
I was also wrong about the date of the original DIN
speed standard. DIN 4512 was 1934 not 1936.
Peter.
--
pirwin@[EMAIL PROTECTED]
