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

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Subject: [Leica] Another M9 question
From: mark at rabinergroup.com (Mark Rabiner)
Date: Tue, 05 Oct 2010 20:49:18 -0400

Your right its one stop of light for half or twice distance.

--------------------
Mark William Rabiner
Photography
http://gallery.leica-users.org/v/lugalrabs/
mark at rabinergroup.com


> From: Philip Forrest <photo.forrest at earthlink.net>
> Reply-To: Leica Users Group <lug at leica-users.org>
> Date: Tue, 5 Oct 2010 20:40:25 -0400
> To: Leica Users Group <lug at leica-users.org>
> Subject: Re: [Leica] Another M9 question
> 
> Its a 1 stop difference, not two.
> Phil Forrest
> 
> -----Original message-----
> From: Mark Rabiner <mark at rabinergroup.com>
> To: Leica Users Group <lug at leica-users.org>
> Sent: Tue, 05 Oct 2010, 20:10:42 EDT
> Subject: Re: [Leica] Another M9 question
> 
> 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
> Photography
> http://gallery.leica-users.org/v/lugalrabs/
> mark at rabinergroup.com
> 
> 
>> From: Tom Schofield <tomschofield at comcast.net>
>> Reply-To: Leica Users Group <lug at leica-users.org>
>> Date: Tue, 5 Oct 2010 15:03:19 -0700
>> To: Leica Users Group <lug at leica-users.org>
>> 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
> 
> 
> 
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> 
> 
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Replies: Reply from mark at rabinergroup.com (Mark Rabiner) ([Leica] Another M9 question)
Reply from photo.forrest at earthlink.net (Phil) ([Leica] Another M9 question)
In reply to: Message from photo.forrest at earthlink.net (Philip Forrest) ([Leica] Another M9 question)