Archived posting to the Leica Users Group, 1999/07/07

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Subject: [Leica] Re: Noctilux Gloom-Buster VS 75mm f/1.4 ..
From: Akhil Lal <>
Date: Wed, 07 Jul 1999 19:40:34 -0400

If I remember correctly, DOF, to first order, depends on the absolute
aperture. The noctilux has an aperture of ca. 51mm, whilst the 75/1.4's
is about 54 mm. I'd expect the noctilux to have greater DOF wide open. 

As always, I'm open to correction.



> Mark Rabiner writes:
> > I'm wondering what the difference would be a say 4 feet away DOF wise
> > both lenses wide open?
> > My hunch is the Noct would give you about 1 inch front to back and the
> > 75 would give you 2.
> At 4 feet the 50mm f1 gives you 1.44 inches, the 75mm f1.4 gives you 0.72
> inches.
> So you were close, but the wrong way round.
> David Morton