Andrew Fildes wrote:
> There's at least 5 versions of that one.
> MF metal 1:2 F2.5 49mm filter. Adaptall
> MF plastic 1:2 F2.5 55mm filter. Adaptall
> MF 1:1 F2.8
> AF 1:1 F2.8
> AF 1:1 F2.8 Di
>
I have the first and last of those, bookends.
At full pixel, full frame, I had this to say when I tested them:
"As with contemporary zoom designs, the Di shines wide open, with f2.8
actually its optimum aperture for sharpness at 1:2 and 1:1, although f4
is pretty close at 1:2.
I also compared the new f2.8 Di design Tamron SP with the much older
f2.5 MF design. The newer design beats the older one across the tests I
did, but not by much; the difference is pretty small, in general. Like
the Di, the f2.5 likes to be a bit open at 1:1, with f4 being better
than f8. Of course, the Di focuses directly from infinity to 1:1, while
the old one needs an extension tube to get to 1:1, as does the Zuiko.
All the f-stops noted are lens settings, not effective apertures, which
get slower as magnification increases. "
Moose
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