Moose wrote:
>The 12-50 in Macro mode is a fixed 43 mm. In real repro ratio terms, it is
>1:2.8
>(0.36x). Adjusted for sensor size, such that the whole image is displayed at
>the
>same size for both formats, that is, 4/3 is magnified twice as much as FF. The
>effective repro ratio is then 1:1.38 (0.72x).
I've never really seen the point of measuring "macro-ness" in terms of ratio
between
recording medium and size of subject -- absolute size of the area covered is all
that counts in the end, as far as I can tell, though scaling that relative to
the
negative size certainly gives a convenient number to work with.
With digital, I guess you could also take number-of-pixels into account and
come up
with a pixels-per-millimeter measurement; so the old CP4500 I had covers 17mm
across
the frame, but that's 2272 pixels -- E-M5 + 12-50 at macro covers 48mm across
the
frame with 4608 pixels, which gives the Nikon the edge in this case, 133px/mm
-vs-
96px/mm. That said, the CP4500's working distance is very small, which is
either good
or bad depending on the subject -- but the super-tiny sensor on the coolpix
results in
lot of depth of field, which _is_ good.
>The 12-50 in Macro mode is effectively more of a macro lens that the
>traditional
>OM Macros. Of course, it is actually 43 mm, so the working distance is
>shorter.
Interesting! I never had the OM 50/3.5, though, I had the vivitar 55/2.8,
which did
go to 1:1 (heh, there I go using exactly the thing I was decrying above) -- I've
tried the bellows lenses (38 and 20/3.5) but lighting is a big pain there and I
can
only get anywhere with very static subjects.
>MikeG and I did an informal, but fairly careful, test of 12-50 vs. 50/2 OM
>Macro
>lens on one of his orchids. My conclusion is that they are essentially equal
>in
>IQ, at least in the central area. The subject didn't lend itself to edge
>evaluation.
And that is _very_ interesting, because the 50/2 is reputedly one of the
sharper
lenses out there. I should do some more testing myself!
thanks for the info!
-- dan
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