Chuck,
Thanks for puncturing my bubble;~) I realize that you are in fact correct,
but, for my use and 1200-pixel width web postings, it works out fine for me.
In comparing images from the Leica 28mm using zone focusing, and the ZD 35
Macro with AF, which is no slouch in sharpness, I feel that the 28 has a
slight edge. For walk-around snaps, I haven't found a better solution.
Jim Nichols
Tullahoma, TN USA
----- Original Message -----
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Monday, July 23, 2012 7:42 PM
Subject: Re: [OM] IMG: From the Airport - Again
>I hate to tell you this but you don't have the same DOF as a 28mm lens
> on 35mm. When computing depth of field one of the important parameters
> is resolution. Since a 4/3 image requires twice the magnification of a
> 35mm image to make an equivalent print or viewable image you must also
> capture double the resolution. The short focal length still pays a
> benefit in terms of better depth of field than a 56mm equivalent on 35mm
> but it doesn't equal the 28mm on full frame.
>
> 28mm on full frame, resolution 30 lines/mm, focus at 5 feet
> near focus = 3.3 feet, far focus = 10.2 feet
> 28mm on 4/3, resolution 60 lines/mm, focus at 5 feet
> near focus = 4.0 feet, far focus = 6.7 feet
> 56mm on full frame, resolution 30 lines/mm, focus at 5 feet
> near focus = 4.5 feet, far focus = 5.7 feet
>
> Chuck Norcutt
>
>
> On 7/21/2012 7:31 PM, Jim Nichols wrote:
>> As I see it, I have the field of
>> view of a 56mm, with the DOF of a 28mm. While focusing with the VF is
>> difficult, it can be done, but, with the forgiving DOF, and good scales
>> on
>> the lens, zone focusing is a breeze. Add a little FM to the workflow,
>> and I
>> like the images that I am getting.
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