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[OM] Hyperfocal scales and zoom lenses.

Subject: [OM] Hyperfocal scales and zoom lenses.
From: "Brian Swale" <bj@xxxxxxxxxxxxxxx>
Date: Fri, 30 Nov 2001 10:33:58 +1300
Hi;

The Zuiko 35 - 105 zoom has hyperfocal scales. The 100 - 200, not.

Brian
> 
> Date: Thu, 29 Nov 2001 12:48:59 -0800
> From: John Hudson <jahudson@xxxxxxx>
> Subject: Re: [OM] hyper focal scales, or lack there of
> 
> Clendon Gibson wrote:
> > 
> > I have noticed that most of my zooms lack a hyperfocal
> > scale on the barrel (or anywhere else that I know of).
> > 
> > I figured I would ask the wise and beneficent members
> > of the list for work arounds.
> > 
> > In other words, if you wanted to do a landscape with
> > infinty at the far end and 8 (or whatever the lens can
> > do) for the near end at f16, how would you manage
> > without the scale?
> > 
> > Thanks!
> 
> For any given focal length a particular aperture will give a specific
> range in front of and behind the subject which will be in focus. Alter
> the focal length but hold the aperture constant and the front to back
> distance of that range will also change. Alter the focal length and
> alter the aperture and the depth of that range will change again.
> 
> It seems to me obvious why a zoom lens does not have a hyperfocal scale
> on the barrel; there are two variables at play, namely focal length and
> aperture both of which impact upon the depth of field.
> 
> jh
> 


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