>
> 75-250/3.8-4.5 Model 04A dates from 1979 to 1982.
> 75-250/3.8-4.5 Model 104A dates from 1981 to 1984.
> Slight differences in optical construction, dimensions, weight and close
> focus capability.
>
> I would speculate that each was a well built lens able to compete with the
> best third-party lenses of the time. But neither of them was in Tamron's
> SP
> ("Superior Performance") range. The SP60-300 is *smaller* than the
> 75-250,
> though 50 grams heavier, (perhaps due to larger number of elements). Why
> do
> you think the 75-250 would perform better?
**Total** **guess** on the rule of thumb (my father taught me) that its
easier to make a high quality lens covering a small range than a larger
range.
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