Hi,
That little business is over; had an appointment to revise my will - must
make sure all the little Zuikos and OMs got to a good home when I go ...
Benson wrote
> > You can buy a lens reversing adapter, so you don't have to hold the
> > lens. I have one, but I have never used it. It mounts in place of the
> > lens, and the lens screws onto the adapter using the filter threads.
John Shaw's book on macrophotography covers this stuff. (Close-ups /
Closeup photography in Nature?) I took his advice and bought these Hama
accessories for OM about 20 years ago;
stop-down ring (for reversed lenses),
reversing ring, and
male/male threaded ring for mounting lenses front element to front element.
Haven't used them for a while since I got closeup tubes and now a macro.
Don't overlook the screw-in auxiliary lenses (49mm and 55mm ) that screw
on the front to give macro. They are a nice compact means of getting macro
performance out of a standard lens.
DOF.
I don't know how much notice one should take of the DOF scales engraved
on lens barrels, but this is what some of my lenses have. Because this
thread came out of a remark I made about the Zuiko 100/2, these are all
lenses set at 100mm focal length.
F stop 22, one end of the line on infinity.
The other line fell on the following distance (metres)
100/2 10
100/2.8 7.5
35~105 4.75 (this was difficult to be sure as there is no f/22 line on
this
lens, but if there were, judging from the spacing of the other lines, that's
where it would be.
F stop 16, one line on infinity
100/2 14.6 (difficult to be sure - about 48 ft - doesn't have line
for f/16)
100/2.8 8.5 (difficult to be sure - no f/16 line)
35~105 8
The 100~200, and 75~150 zooms do not have DOF lines so I could not take
a reading from them.
Here are some on-line refs.
http://fox.nstn.ca/~hmmerk/DOFR.html
http://www.dof.pcraft.com/dof.html
http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=0013uk
(Find the following quote)
" Contrary to popular belief not all lenses with the same focal length produce
the same depth of field at the same aperture! " ( Dr Kornelius J. Fleischer )
Cheers, Brian
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