"Bruce" wrote in message ...
On Mon, 19 Oct 2009 08:00:33 +0800, "Gerrit"
wrote:

I wish to buy a set of rings to give macro capability to my camera.
I have a Nikon D50 body married to a Tamron AF LD 28-200 lens.
My question to all you knowledgeable people is this: would a Kenko Automatic
Extension Tube Set DG for Nikon AF be suitable and would all the functions
on the D50 be enabled?

Yes, this should work. But the lens will not be capable of producing
good, sharp results with the extension tubes. A dedicated macro lens
would give much better results.

The above is correct, but ***sometimes*** some combinations
of a ***good*** zoom and an achromat (a 2-element close-up
lens attached to the front of the lens), when used at some FLs, and
with the lens stopped down quite a bit (and either on a tripod or with
flash to make that possible) can produce good sharpness with a
zoom for taking macro photos. With the Tamron, playing with its
zoom range, focus, and aperture settings ***may*** produce a
combination with a not-too-strong achromat that is reasonably sharp
for the OP's purposes - but a dedicated macro lens would be an
easier (and likely better) solution. BTW, if an auto diaphragm is not
needed, old enlarger lenses adapted to tubes or a bellows can be
an inexpensive way to making sharp close-up images...
--DR