Archived posting to the Leica Users Group, 1999/11/29

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Subject: [Leica] RE: Re: 75mm f1.4 DOF
From: Jim Brick <jimbrick@photoaccess.com>
Date: Mon, 29 Nov 1999 15:08:48 -0800

When focused at exactly the same distance, the 75/1.4, at f/1.4 has "less"
DOF than the 50/1.0 at f/1.0. When focused at 5 feet, the 50/1.0 at f/1.0
has two inches of DOF coverage. When focused at 5 feet, the 75/1.4 at f/1.4
has less than one inch of DOF. If you independently move the cameras so
that the image size on the film is equal, the DOF at identical f/stops will
be identical. Here, the Noctilux, because it has f/1.0, it can render less
DOF when the image sizes are equal. f/1.4 vs f/1.0. Go to
http://www.cs.ucla.edu/~simonw/DoF/ to do your own calculations.

Jim


At 06:25 AM 11/30/99 +0000, D Khong wrote:
>
>This provokes my asking two more questions:
>
>2. There is considerable concern about the shallow DOF at f1.4. How does
>this shallowness compare with the Noctilux used at f1? I have the Noct and
>so will appreciate any user of both lenses giving me an opinion.
>
>TIA
>
>Dan K.