Archived posting to the Leica Users Group, 2001/01/09

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Subject: Re: [Leica] 90mm recommendations
From: "Dante A. Stella" <dante@umich.edu>
Date: Tue, 09 Jan 2001 07:55:33 -0500
References: <20010109120312.UWAI17226.femail1.sdc1.sfba.home.com@[65.1.114.25]>

Henry,

As far as I can tell, T400CN has 15 stops of contrast.  I thought that
translated into more bits (since it's about 1 bit per zone).  At any rate,
it should be scanned in 16-bit color and then squashed into one color
channel, but that was not practical, given the color corrections and
ultimate file size target.  Maybe there is a better way to express this.
T400 has no shoulder for about 15 stops.

Dante

Henry Ambrose wrote:

> >Here are some pictures taken with two of the greatest cheap medium teles
> >in M and M39.  These will be gone in a couple of days, so look now.   It
> >should open the eyes of some people here.
>
> OK, I agree.
> As far as the 90 goes I think any decent lens at f5.6 will give good
> results.
>
> There is a lot of good to be said about C41 B&W films both Kodak and
> Ilford. I think that either of them come very close to good 100 speed
> conventional film.
>
> I'm not surprised by the above.
>
> I am surprised how well the Nikkor did.
>
> Bits are not a measure of tonal range. Do you mean stops?
>
> Henry

In reply to: Message from Henry Ambrose <henryambrose@home.com> (Re: [Leica] 90mm recommendations)