Hmmm. After reading your intro here I thought you were declaring
victory. But I sure don't see any difference between 5.8 and 6.4
meters. But that was tougher than really required I think. Moving the
goal post a full meter between the OM 24/2.8 at 5 meters and the OM Zoom
at 24/3.2(>) at 6 meters will move the depth of field 5 meters further out.
I did try this test myself a little while ago using the A1 since it's
the only thing I have with "live view". But I no sooner got going when
I suddenly realized my simulation was totally invalid. The A1 has so
much depth of field at 7mm (28mm equivalent) even at f/2.8 that I
probably couldn't have told the difference between 2 meters and
infinity. So I quit.
I think my hypothesis is still holding but I suspect you're not going to
try the extra 1/2 meter to disprove it. Just send me your camera and
lenses and I'll do it. :-)
Chuck Norcutt
Ken Norton wrote:
> OK, Chuck. You are now officially on my "You prove it first" list.
>
> I tested my ability to focus the L1 with 10x magnification in
> Live-View with the OMZ 24mm F2.8 lens as well as the Leica lens set to
> the same focal length. For this test, I shot both lenses wide-open.
> The results are presented at 100% pixels from top-to-bottom (narrow
> strips). The camera was focused on three different points for each
> lens.
>
> Distances used: 19, 20 and 21 feet, which translates to 5.8, 6.1 and
> 6.4 meters. This is half the spread that Chuck suggested. I suppose I
> could have used greater intervals, but my own pride got in the way and
> I went for the ultimate challenge.
>
> Results presented in a composite picture on www.zone-10.com
>
> Personally, I think I did pretty good.
>
> :)
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