Hi Ian!
I'm sure others can speak about the Canon system and more about the OM
system, but I would say you should look at the 135mm/4.5 Zuiko macro and
65-116 variable extension tube. The lens will cost you about $200 to $250 if
you are patient and the extension tube about $150 to $170. Another
alternative that people rave about on the list is the 90mm/2 Zuiko macro.
This lens focuses to 1:2 at .4 meters (or metres :-). The 135/4.5, on the
hand, focuses to 1:2 at .6 meters (do I have this right everybody?). The
advantage of the 90/2 is that it is _fast_ and can be used with available
light easily. The 135/4.5 with variable extension tube is a little bulkier
and often requires the use of a flash ($300 for a T-28 Twin Flash with
T-Power control). The drawback of the 90/2, as everyone will tell you, is
the price and rarity. These lenses can go for as much as $750 (new from B&H
for $1000), but one was offered to the list for the bargain price of $550. I
recently found one for $400 but have yet to receive it (along with a 18mm/3.5
for $325...and some other goodies at prices that I couldn't pass up). The
90/2 can also substitute as a great portrait lens and save you from having to
buy the 85/2 and 100/2, and lens tests have shown this lens to be one of the
best 90mm's out there. But what do I know? I don't even have the lens yet!
The 135/4.5 is still a first class lens and will focus to infinity on the
variable extension tube. I have been very pleased with its sharpness and
contrast. I don't know if the 200mm/4 or 200mm/5 can be used on the variable
extension tube. Anyone have any luck with this combo?
Oh, and you are probably asking the wrong bunch of blokes for compliments on
the C*n*n system :-)...who was a 8-) until LASIK on Friday!
I hope this helps,
--p.j.
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