[Leica] What film did HCB use?

[mark at rabinergroup.com (Mark Rabiner)]

Yes the Ilford and Kodak films didn't get faster it was just the way in
which its speed was measured changed.
These people are implying some padding was no longer put in a one f stop pad
but what all I'd previously read was the film speed changed to reflect
shadow detail while before it was mid tones. A much more logical and
accurate way of measuring real film speed. I don't think it was really an
issue of "padding".
So both tri x and HP whatever were really 400 by today's measuring it was
just recommended they be shot at 200.

You ask an old timer from that era and the reason why they don't remember is
they weren't using a meter anyway. It was all intuition with a number on it.

Mark




> From: John McMaster <john at mcmaster.co.nz>
> Reply-To: Leica Users Group <lug at leica-users.org>
> Date: Thu, 9 Jun 2011 03:47:24 +0000
> To: Leica Users Group <lug at leica-users.org>
> Subject: Re: [Leica] What film did HCB use?
> 
> And from the 1943 HP3 entry "(post 1960 the 200ASA emulsion was revised to
> 400ASA but there was no actual speed increase, it was in recognition that 
> with
> better exposure determination methods at that time, there was no longer 
> need
> for all film manufacturers to include an exposure safety margin. This 2x 
> speed
> increase applied to all black&white films of all makes)."
> 
> john - with a quiet day at work