The difference was between the 90mm f/2.5 version, and the f/2.8 version.
Since you mention the 1:1 extender, it is probably the F/2.5 version.
f2.5 = great
f/2.8= not as good
Larry
andrew fildes wrote:
> Just been offered a Tamron SP 90mm Macro with 1:1 extender. It's the 55mm
> filter ring version. I remember a discussion on the relative merits of the
> 55mm and the older(?) 49mm version - was the difference in the build
> quality only or was there a difference in performance too?
> AndrewF
>
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