Archived posting to the Leica Users Group, 2010/10/05

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Subject: [Leica] Another M9 question
From: mark at (Mark Rabiner)
Date: Tue, 05 Oct 2010 20:10:42 -0400

DOF (depth of field) is a mixed bag when you have things perfectly in focus
but dropping off fast into the darkness with the inverse square law. Or
whitening out before you the same as things get closer.
With each doubling or halving of light you gain or loose two f stops.
That's the inverses square law. As I understand it. Having flunked math.
You can not miss nailing your focus with flash as it allows you to stop down
a bit or stop in fact way way down in fact:
But there is only one point front to back in which its exposed right.
Not that you even it out like crazy with Photoshop and grad masks.

Bounce flash off the ceiling is a good way around this.

Mark William Rabiner
mark at

> From: Tom Schofield <tomschofield at>
> Reply-To: Leica Users Group <lug at>
> Date: Tue, 5 Oct 2010 15:03:19 -0700
> To: Leica Users Group <lug at>
> Subject: Re: [Leica] Another M9 question
> Very true!  I bought the sf20 when I bought the M7 and maybe used it twice!
> Which is to a large part why I don't want to spend $500-800 on a new flash!
> Sometimes when I take shots of my wife's preschool class, I want more DOF 
> than
> available light allows, and I am thinking of trying macro with it either 
> with
> a viso or a macro adapter, if I could find one used.  (I can get pretty 
> close
> with the 75mm, too.)
> Of course, a cheap canon dslr with an R adapter might be an easier choice 
> for
> macro.
> Tom

Replies: Reply from photo.forrest at (Philip Forrest) ([Leica] Another M9 question)
In reply to: Message from tomschofield at (Tom Schofield) ([Leica] Another M9 question)