I am buying Piers 90/2.5 lens.
And will later find a 17/3.5
in OM and N*kon mounts.
I have also to find one focal length between...
Thank you for your experiences like below.
Christian
Le Dimanche 26 Septembre 2004 08:52, vous avez écrit :
> At 03:22 AM 9/25/04, Moose wrote [in part]:
> >There have been lots of replies, including mine, but no one has
> >addressed a couple of general issues.
> >
> >No manufacturer has always made only really great lenses. Even with the
> >finest makers, some lenses are better than others. Add in the length of
> >time over which major makers have been making lenses and the great
> >changes in optical technology over that time and the fact that most have
> >made various quality lines, and generalizations are meaningless.
>
> [snip]
> Absolutely . . .
> Tamrona, Kiron, Sigma, Tokina, Vivitar, etc. . . .
> They all make . . . or made . . . a number of stellar lenses. They all
> make . . . or made . . . some truly abysmal lenses. The quality range in
> optics and build among them is enormous. Not only can price can be
> deceiving, the specific line name can be as well. Don't count on markings
> such as "SP LD" or "AT-X" as a guarantee of high performance, or even above
> average.
>
> It is not uncommon for an older design to be much, much better than a
> current one that replaced it. An older Tamron Adapatall II lens and its
> current successor is good example. Tamron made a 35-105mm f/2.8 SP LD
> sometime during the latter 1980's and into the 1990's. This is a truly
> fine lens with well above average build and very excellent optics,
> including bokeh, throughout its aperture and focal length range. It was
> replaced in their "top end" line of lenses at some time during the latter
> 1990's by a 28-105mm f/2.8 SP LD. The new (and current) lens is a dog with
> low contrast and poor MTF across its aperture and focal length ranges. It
> also has very noticeable barrel distortion that shifts to very noticeable
> pincushion distortion as the focal length goes from short to long. Yet it
> sells as part of their "pro" line with pro level pricing. Whatever Tamron
> did to its formulation to extend the wide end down to 28mm destroyed
> it. It's a very fast constant aperture lens for one with a 4X focal length
> range, but that's about all it is and that's about all you get for a huge
> pile of money . . . other than a very large and heavy lens too. IMHO it's
> a good doorstop. Not picking on Tamron in particular . . . examples of
> this can be found among all the brands.
>
> If a primary goal is having the best glass, doing some research about which
> specific lenses are excellent in optical and build qualities is essential.
>
> -- John Lind
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