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

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Subject: [Leica] WTB : Noctilux (UK)
From: lug at (Steve Unsworth)
Date: Mon Jan 1 06:28:48 2007

You're taking in more light, but the aperture is physically smaller. As I
said earlier if lenses worked the way you described then meters would have
to have the focal length factored in since f1.4 @ 35mm would be equivalent
to f1 @ 50mm, and that isn't the case.


On 1/1/07 13:24, "Tina Manley" <images@InfoAve.Net> wrote:

> At 06:04 AM 1/1/2007, you 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.
>> Steve
> Steve -  I'm not talking about photographing a white wall.  I'm referring
> to photographing a normal scene - in a house, usually for me.  The wider
> view is, the more light I'm taking in normally.  That's the way it works
> for me anyway.  I can photograph the same scene with a 35 and a 50 and the
> 35 gives me a brighter reading of the whole scene.  Not spot metering,
> averaging the whole scene.

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