Since it's a DSLR (and not an E-330) the rear screen is not live during
focusing. I know the plane of focus is not flat but if I'm focusing
correctly the center part of the image (which is what I focused on)
should be sharp while the edges might not be. Instead, I found the
opposite to be true.
I know, the conclusion is that I'm not focusing correctly.
Chuck Norcutt
tOM Trottier wrote:
> On Wednesday, May 31, 2006 at 14:40,
> Chuck Norcutt <olympus@xxxxxxxxxx> wrote:
>
> ...
>
>>So far I've only analyzed the results for 28mm but here's what I've
>>seen so far. The first startling observation is that every single
>>autofocus shot on the Tokina looks better than the corresponding
>>manual focus shots on the same lens. Not by a great deal but enough
>>so that you'd readily pick one over the other. That was a bit of a
>>shock. I don't know if it's my eyes or the screen but it's a fact.
>
>
> I'd get the screen or camera checked, or the adjustment of any dioptre
> adapter.
>
>
>>The next shock was that I rated the performance of the Kiron 28-70/4
>>as "unacceptable" at center from f/4 thru f/8 and "poor" at the
>>edges through f/8. It didn't produce what I'd call a decent image
>>until f/11 and was still performing better at the edges than center.
>
> ...
>
> That does sound like a focus error since the "plane of focus" is often a
> sphere or parabola.
>
> Does the 5D have a display and magnify function for the rear screen during
> manual focus? - an
> electronic VariMagni? You could try bracketing focus slightly, then magnify
> the results.
>
> tOM
>
> --
> tOM Trottier, Ottawa, Canada
> 758 Albert St, Ottawa ON Canada K1R 7V8
> +1 613 231-6115 N45.412 W75.714
> http://groups.yahoo.com/group/ottawa-photo-clubs
> "The moment one gives close attention to anything,
> even a blade of grass, it becomes a mysterious,
> awesome, indescribably magnificent world in itself "
> -- Henry Miller, 1891-1980
>
>
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