Archived posting to the Leica Users Group, 2007/01/01

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Subject: [Leica] WTB : Noctilux (UK)
From: richard-lists at (Richard)
Date: Mon Jan 1 03:10:43 2007
References: <> <>

Steve, I could be wrong, but think of it this way: the exposure value for 
the mid-tone must be the same, but the total number of photons gathered 
must be larger for wider angle lens.

At 03:04 AM 1/1/2007, Steve Unsworth wrote:
>I'm sorry Tina, but I don't get this. Imagine you were photographing a white
>wall that filled the viewfinder for both the 35mm and 50mm lenses. The
>exposure for each lens would be identical - i.e. both lenses would have the
>same shutter speed / aperture. You can't say that because a lens is wider it
>somehow sucks in more light at a given aperture - if that was the case hand
>held meters wouldn't work over a range of focal lengths.

// richard (This email is for mailing lists. To reach me directly, please 
use richard at 

Replies: Reply from lug at (Steve Unsworth) ([Leica] WTB : Noctilux (UK))
In reply to: Message from images at InfoAve.Net (Tina Manley) ([Leica] WTB : Noctilux (UK))
Message from lug at (Steve Unsworth) ([Leica] WTB : Noctilux (UK))