In a message dated 00-01-30 03:20:39 EST, you write:
> OK, ignorant question mode. One of the things I just discovered I owned (in
> the bag of a kit I bought) was a Nikon CU filter. Oddly, it also seems to
be
> a 49->55 stepup ring at the same time. Is that possible? Actually, the
> question is, what's the effect of the CU? The seller also included a set
of
> Hoya +1,+2,+4, so he must have been doing some closeup work (the detective,
> if you remember the story, you have to wonder what he was taking pictures
> of).
>
> Thanks.
>
> Tom
Close up lens change the focal length of your own prime or zoom lens and
allow you to focus much closer than normal. Your detective seemed to like
good quality close up lens. The Nikon is either the Nikon 3T, or 4T 52 mm
with diopter corrections of +1.5, or +2.0 $29.95. This is a two element
diopter that corrects aberrations much better than the single element
diopters such as to Hoya. The regular Olympus diopters are only one element
except for the ones that matche the 80/4 macro and the IS series.
Put them on your normal lens and see what they can do. The single element
ones need to have the lens stopped down to at least f8 for quality. See the
following site for formulas on how to figure out the closest focusing
distance based on the diopter strength.
<A HREF="http://www.angelfire.com/ca/erker/closeups.html";>Currently
Available 2 Element (Achromatic) Close Up Lens...</A>
or: http://www.angelfire.com/ca/erker/closeups.html
Have fun. I would keep these until you got either a macro lens, bellows or
extension tubes.
Warren
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