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Re: [OM] (Fwd) wildflower macro

Subject: Re: [OM] (Fwd) wildflower macro
From: WKato@xxxxxxx
Date: Sun, 30 Jan 2000 04:09:14 EST
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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