I recently acquired a Tamron mid-range zoom lens, PK mount, with Auto setting and Autofocus capable.
Range is 28 - 80 mm.
Speed is f:3.5 to f:5.6.
Yesterday, Saturday the 28th of April, I took it to the St.Louis Zoo to test it out.
Body was a Pentax ME Super, and so lens was tested with manual focus, and aperture priority metering.
Film was Fuji ASA 400 print film.
The weather was great, the zoo was fairly crowded.
Lens did generally okay.
It is not as fast as the lenses I normally work with, but size of lens helped steady it.
And I noted spatial distortion out near the periphery of the image at the 28mm end of range (see the "crowd" photo below, and how figures at the far left are distorted).
All images are ©2007 E.J.Kowalski.