Hi Wayne,
That is no el-cheapo beater.
That Tokina AT-X, 28-85mm, 7:3.5-45 Lens. #1308854252 for $30 is an
almighty great Fang!
Look at these figures from Gary Reese's page
Well done. Look after it
Brian
Tokina AT-X 28-85mm f/3.5~4.5
OM-4 with mirror and diaphragm prefire
@ 28mm setting
Vignetting = B+ @ f/3.5, A- @ f/5.6, A thereafter
Distortion = slight barrel
Aperture Center Corner
f/3.5 B B-
f/5.6 A B+
f/8 A B+
f/11 A- A-
f/16 A- A-
f/22 B B
Notes: Moderately high contrast at f/3.5, f/5.6, f/16 and f/22; high
contrast at f/8 and f/11.
@ 50mm setting
Vignetting = A- @ f/4, A thereafter
Distortion = very slight waveform with no tendencies
Aperture Center Corner
f/4.0 B B
f/5.6 B B
f/8 B+ B+
f/11 A- A-
f/16 A- A
f/22 B- B
Note: High contrast at all apertures.
@ 80mm setting
Vignetting = A- @ f/4.5, A thereafter
Distortion = slight waveform with slight pincushion tendency
Aperture Center Corner
f/4.5 B- B-
f/5.6 B B-
f/8 A- B
f/11 A B
f/16 B+ B+
f/22 B+ B
Note: Moderately high contrast at f/4.5, 5.6, f/16 and f/22; high contrast
at f/8 and f/11.
...................................................
Zuikoholics, enablers, one and all.
Feeding fantasies, emptying pockets!
---------------------------------------------------
Brian Swale, 140 Panorama Road,
Christchurch 8008, N.Z.
Tel +64 3 326 7447
http://homepages.caverock.net.nz/~bj/photography/
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