Multipasser wrote:
>Hey
>
>I just bought a Auto extension Tube for macro photography.
>I'm not yet in possession of a Macro lens but i'm trying to find one on ebay.
>(I would like a 50mm 3.5 because they are cheap).
>
>I just tested the 50/1.8 lens I got with the tube on full extension mode and
>I'm getting 2x (lifelike) magnification!
>But the distance from lens to the object is like 5cm :)
>
>Now I was wondering how that would be with the 50mm 3.5 macro lens!? It can
>do 2.8x magnification with the tube. But am I more away from the lens?
>Because taking a picture of a bug its hard when you have to come so close as
>5cm :)
>
It will be just the same problem with the 50/3.5, only worse because you
can increase magnification even more with the longer focusing extension
of the lens, swhich further shortens teh working distance. To get
greater working distance, you need a longer focal length. Then to get
the same magnification, you need more lens extention. Take a look at the
tables here
<http://olympus.dementia.org/eSIF/om-sif/macrophotogroup/auto_tube_65-116.htm>.
The ones in the PDF manual available at the bottom of the page are more
readable. There is much more useful stuff in the Olympus Way tables on
Mark's site <http://olympus.dementia.org/Hardware/PDFs/OM_Way-tables.pdf>.
I use the 50/3.5 for work on a copy stand. Outdoors, a longer focal
length is useful. There are a lot of great thrid party macro lenses in
the 90+ mm range. The Zuiko 90/2 is a great lens in many ways, but only
focuses to 1:2 on its own. The Zuiko 135/4.5 is an excellent lens with
good working distance. However, because of its longer focal length, it
doesn't quite get to 1:2 on the 65-116 Auto Tube. You need bellow to get
greater magnification.
I very much like the Kiron 105/2.8, which focuses from infinity to 1:1
directly and is optically excellent. Tamron, Vivitar and Tokina have all
made excellent 90mm macro lenses, some of which focus to 1:1 directly
The combo Curtis just posted about buying "At the same sale, I picked up
a Tamron SP 90mm f/2.5 Macro (52B) with attached Tamron 01F 2X
converter." is very useful. It makes a 180/5 lens that focuses directly
to 1:1, which allows close-up shots without scaring the bugs - or
without them bugging you
<http://www.moosemystic.net/Gallery/MPhotos/Tam902.5/>!
Moose
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