On Fri, 8 Jul 2005, Boris Liberman wrote:
My answer to similar question was to buy Tamron 90/2.5 SP lens in Adaptall 2
mount. It is fast and quite excellent optically. It is manual focus, but I
don't find it an obstacle. Actually for macro work manual focus lenses are
probably better because of the better damping of there focus rings - hence
better focus precision.
I have the 90/2.8SP AD2. It is MF, but the design is AF and the manual
focusing feel is looser. I think it also turns less end-to-end than
the older 2.5 version; this I like. Also, I think the 2.5 is a 1:2
(1:1 with a dedicated extender), while the 2.8 is 1:1 on its own.
http://www.epcc.ed.ac.uk/~kavousan/Tulip2.jpg
I don't feel I need AF for Macro. The main reason is perhaps that most
of my cameras don't feature selectable AF points; in most cases I
don't like my subject centred. Even if they did, I am not convinced.
I had a SMC Pentax-A Macro 100:4; it is a very sharp lens, but I could
not justify both lenses so I let it go.
Kostas
