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Re: [OM] Zuiko 21/3.5 test images

Subject: Re: [OM] Zuiko 21/3.5 test images
From: frieder.faig@xxxxxxxxxxxxxxxxxxxxxxxxx
Date: Fri, 21 Jun 2002 23:58:39 +0200
On Fri, Jun 21, 2002 at 10:00:32PM +0200, Jochen Schiffler wrote:

> I'm sorry! I posted the initial message without thinking about it but I
> learned from your contributions!

We all learn here every day. Thanks for sharing your testing.
So we can  learn from.  No lens can cover all photographic needs.
Testing is necessary to find out, for what situations a specific lens is 
appropriate for.

Well. When the ede blurr is caused due to curvature of field, then it 
should be possible to get a image with sharp corners and blurred 
center. It would be interesting to a serie with shifting the focus.
I did this with a Zuiko 1.4/50 SC at F1.4 and ~ 1:30 magnification. 
And got really one slide where all corners are better than the center.
Differences were not much, only visible when carefully examining 
the slide. -> Nothing to worry about.

Another question using wide-angel lenses:

What happens when your composing your subject not in the center. 
When you use the central focusing aids, and then turn your camera
for about 30° when reframing, the distance of the rotated focusing plane
containing the subject would be ~cos (30°) =13 0.000000e+00ss far away from the
camera. -> lot of d.o.f. necessary. 
So it would be better to focus on the matte-area? - Any experiences?

Frieder Faig




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