[KOML] Depth of Field

[Tom Cogbill <zloi@seanet.com>]

Returning to the Depth of Field Question on Koni-Omega Lenses...

apparently there is some misunderstanding as to what I am talking
about.  On my 90 mm K-O lens, if you pull out the lens hood at the end
of the barrel, a scale is revealed which correlates f-stop settings with
distances.  This is a depth-of-field scale which, to my knowledge, most
lenses with a fixed focal length have.  But not, unfortunately, the 180
mm lens (nor the 58 mm, though DOF is generally large on W-A lenses,
which is evidently why there is no separate focusing mechanism for it.
The scales on the focusing knob simply indicate focusing distance).   I
was just wondering why these lenses have no DOF scales.

Thanks much to George for the link to the K-O manual.  It is far more
informative than the rather silly "manual" that accompanied the version
I bought.  (My camera, incidentally, has some slight variations from
what is described in the on-line manual.)  I note that it gives DOF
tables for all the lenses, so I guess they expect you to memorize these
if you  want that info for the lenses other than the 90.

Incidentally, does anyone have the "close-focus" adapters, and if so,
are they worth a damn?  I've heard extension tubes were made for the K-O
models, but that hardly anyone bought them, suggesting they may be
impractical or of too limited value.

--Tom