Depends on what are you checking:
- for resolution, a good one hour lab do better than 2700dpi film
scanner, with a 10x loupe on 4x6 print, not bad for resolution
judgment.
- for color, never use negative.
- for vignetting and distortion, a small print with un-aid eyes is
good enough.
- for tone rendering, again job of slide.
In any case you need a tripod, test with wide open and stop down, for
wide open you need to take a few shoots with re-focus, focusing error
is very easy happen at wide open.
There is certainly different in performance for the two lenses, go
back to a 1991(?) pop photo you will found their test reports.
C.H.Ling
"Richard F. Man" wrote:
>
> At 04:19 PM 1/27/2003 +0800, Albert wrote:
> >4x6 and Loupe..
> >
> >Can't tell the difference... That's not words out of MY mouth, that's
> >words out of the Leica owner's mouth..
> >..
>
> 4x6 is a lousy way to judge lens quality :-) I was reading a report on the
> wonder-Tamron 28-300 (or is it 24-300) lens. The reviewer praises it so
> much, and then says something like the prints are quite good at 4x6.
>
> Arrgggghhhhhhhhhhhh... 8x12 minimum! Otherwise, may as well get a P&S :-)
>
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