Adam Maas wrote:
On Wed, May 12, 2010 at 9:27 AM, Dario Bonazza
<[email protected]> wrote:
Resolution: excellent (provided you put enough a lens in front of it,
otherwise edges are poor). Don't use the provided 2.8/28-75mm (a rebadged
Tamron) full open if you want good resolution at edges.
Dario
The 28-75/2.8 SAM is massively overpriced anyways,
I quite agree. However, don't forget that nowadays there's no relation at
all between the manufacturing cost and the sale price of an item. Industry
tries to produce items at the lowest possible cost and to sell them at the
highest possible price accepted by the market. For a camera priced like the
A850, the price point of this standard zoom is quite OK. Sell the same lens
for APS-C, and its price must go down 50% or more.
the Tamron and
Konica/Minolta versions of the lens are not only optically identical
(Tamron's coatings differ, KM coatings are the same) but far cheaper
and more functional as screwdriver lenses can use DMF focusing mode
for manual focus override, which is lacking on SAM lenses.
I spotted and highlighted that missing feature in the camera+lens review I
did for an Italian magazine. And on top of that, focusing is quite noisy and
continuous-AF performance is all but stellar in this combo, hence I don't
get the reason for using such kind of AF.
From the optical point of view, I don't think the Tamron is a bad lens. On
the contrary, it's a very good performer on APS-C, while on FF it suffers at
edges (as most lenses do, by today's standards). There was a time when
judging lens performance at smaller-detail level was very difficult, while
now everybody blows up images large enough to spot such issues. However,
close down the lens a couple stops and everything goes fine.
Again, I believe the A850+28-75 to be an excellent combo for studio and
generic photography and weaker than expected (by me) for low-light and
action shooting.
Dario
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