Date sent: Thu, 22 Jul 1999 08:37:30 -0400
From: Joey Richards <bigjoe@xxxxxxxxxxxxxxxxx>
> Hello, I'm new to the list and even newer to being an Olympus owner
> (and, in fact, it's my first SLR). I got an OM-1n w/ 50/1.4 from
> Olympus Exchange about two weeks ago and have been very happy so far,
> though I've only gotten back one roll of film so I'm clearly in
> desperate need of taking many more shots.
>
> Anyway, here's a question. A friend of mine has some old Vivitar
> close-up lenses that fit on the front of my 50/1.4 lens. There are
> 3 of them: a #1, #2, and #4, and they can be attached in series.
> According to the instruction sheet that is still with them, they
> should give something like a 1:2.75 close-up on a 50mm lens.
>
> When they're attached, the viewfinder image is clear and the meter
> appears to work as expected, though I don't know if it's accurate.
Everything should work fine.
>
> I'm wondering if there's any hope of these things working well.
> No doubt they're nothing compared to a macro lens, but I'm looking
> for housing in Boston on a student's budget and therefore don't
> have much to spend. If these could give me even a decent close-up
> shot, just to expand the range of shots I can take, I'd be happy.
>
They work by decreasing the focal length of the lens, while the
distance of the lens from the focal plane remains the same.
Because they're usually a single lens, they're not colour corrected,
leading to unsharpness and colour fringing.
The stronger the close-up lens you use, the softer the image. Use small
apertures - this improves the sharpness.
Some close-up lenses are compound lenses which have better corrections.
And are more pricey.
Use until you get your 90mm f/2 macro.
> Any advice would be much appreciated.
>
> Thanks,
> joey
Enjoy, Tom
------------------
From:Tom Trottier, ACT Productions Inc.
__o tom@xxxxxx http://www.act.ca
_ \< +1 613 594-4829 fax +1 613 594-8944
(*)/'(*) 199 Holmwood Ave, Ottawa, Ontario Canada K1S 2P3
"Make it as simple as possible, but no simpler" - Einstein
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