Re: H and D Curve and the ISO Scale equivalents?

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From: Les Newcomer (lnphoto@ismi.net)
Date: 02/12/00-05:28:01 PM Z

I"ve scanned and posted the speed equivalents tables at:

http:/www.ismi.net/~lnphoto/appendixb.jpg

Les

Ray Rogers wrote:

> Hi!
> I was wondering if anyone knows just when we began to
> use ASA numbers? I was looking at 1939-1950 magazine
> ads for Ansco and Kodak sensitive materials and the
> the lack of speed information is, well, noticeable.
>
> Any one know of a chart listing the equivalent speeds
> for the former H&D speeds with the ISO (or ASA)
> speeds?
>
> Thanks... and sorry about the off topic(?)subject, but
> the recent inquires of that um... commercial entity
> just seemed to open this can of worms...that stuff
> about international standards of light and...well if
> you have any information, use your own discretion as
> to whether it should go on or off list. Thanks.
>
> Ray
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