Hi!
Another question is what the right price for it would be.
I found a shop in the UK (or rather, their website) that have both a
used SMC-A 100 F/4 and a Tamron 90mm F/2.5 in stock right now. They ask
for £245 for the Pentax lens, but only 145 for the Tamron *including a
1:1 extension tube*.
I know nothing about SMC-A 100/4. I would suspect however that it also
goes to mere ;=) 1:2... If you can have a look on either of them before
you buy - I'd suggest that too.
I need to look up this page on the web. Somewhere in google it is hidden
:-). There is a test shoot of my very variety of Tamron lens done for
all apertures and both with and without the doubler...
When I saw these tests I was convinced...
Boris