Archived posting to the Leica Users Group, 2002/04/22

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Subject: Re: [Leica] DEPTH OF FIELD PREVIEW
From: "olivier nguyen" <oliviertnguyen@hotmail.com>
Date: Mon, 22 Apr 2002 14:18:26 -0400

Hi Joe,
when I press my DOF preview button with lens open all the way, everything 
look clear. what is this mean ? and when i start to close the lens down to 
let say f5.6 the viewfinder start to look darker and darker.  what is it 
related to open the lens?  I understand that the smaller fstop the more DOF. 
  I just want to relate this with preview DOF.  I will try to see what is 
going on tonight with my DOF preview and will throw out more question if i 
do'nt understnad and see different.

Peter Su, Doug, and Joe,
thank you all of you for helping me
Olivier


>From: "Joseph Codispoti" <joecodi@clearsightusa.com>
>Reply-To: leica-users@mejac.palo-alto.ca.us
>To: <leica-users@mejac.palo-alto.ca.us>
>Subject: [Leica] DEPTH OF FIELD PREVIEW
>Date: Mon, 22 Apr 2002 11:04:03 -0700
>
>From olivier nguyen <oliviertnguyen@hotmail.com>
> >
> >  I don't uunderstand how to use DOF preview on my nikon FM2n.  when i
>press
> > the lever for DOF, I see it deem down in my viewfinder.  what is this 
>tell
>me ?
> >
> >
>
>Oliver,
>
>In order to *see* the limits of depth of field, you need to train you eye 
>to
>look for it.
>
>Try this:
>
>1) Find a suitable scene that will show depth of field easily such as a 
>long
>picket fence.
>2) Stand at an angle to the fence.
>3) Set the lens at its maximum opening (choose a standard or medium tele
>lens).
>4) Focus on at a point on the fence about 10 feet away.
>5) If you are at an angle to the fence you will notice that what you 
>focused
>on, and very little else, is in focus.
>6) Activate the preview feature and close the lens slowly observing the
>change in depth of field. As you close the lens, more of the fence will
>appear in focus.
>The field will darken as you close the lens, but, with a little practice,
>you will still be able to determine what is in focus and what is not.
>
>Best,
>Joe Codispoti
>
>
>
>--
>To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html




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Replies: Reply from "Joseph Codispoti" <joecodi@clearsightusa.com> (Re: [Leica] DEPTH OF FIELD PREVIEW)