On 15 Jan 98 10:26:01 +0100, "Marco" <tom@xxxxxxxxxxxx> wrote:
>On Gio, 15 gen 1998 7:32, Thomas H. Hogan <mailto:flzhgn@xxxxxxxxxxxxx>
>wrote:
>>An inexpensive route to high magnification
>>macrophotography is to use a lens reversal ring
>>to put the lens on backwards.
>
>Another way is to mount a double 49mm ring on the filter thread of *two*
>lenses. You get a double lens very effective for cheap macro. The longer
>lens on the camera. With two 50 mm you get a 25mm in macro 1:1 position
>(absolutely symmetrical if you use two companion lenses). The focus plane
>comes very near the outer element, but this is the only drawback. You can
>focus with the camera-mounted lens, of course. The other focus ring give
>you a sort of retractile hood. No double cable is required. Say you get a
>very sophisticated adjunctive lens.
>
>marco
>
I have never tried this out, but I wonder what quality this setup
might give compared to dedicated macro lenses. Not long ago I bought a
50/1.2 and 50/1.4 set of standard lenses, which had been used for
special macro photography by a university laboratory. The 1.4 had been
on the camera, and the 1.2 was reversely mounted on the 1.4.
I don't know why the experimenter used these expensive fast lenses for
his purposes: in front of the (now) most frontal element (the normally
rear element of the 1.2) he had mounted an extra fixed diafragm
screwed to an OM-mount ring, stopping down the lens to about f:8 (and
giving a very good protection to the glass...)
Anyway, I was happy with the opportunity to buy these lenses, which
only had been used indoors... but why did this institute prefer this
combination over a proper 38 or 20mm macro?
Frank van Lindert.
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