Here is a preview of the SQF test results on two Tokina AT-X telephoto
zooms, tested on a OM-4T:
Tokina 100-300mm f/4 AT-X
OM-4T with mirror and diaphragm prefire
@ 100mm
Distortion: slight waveforming with no tendencies
Vignetting: B+ @ f/4, A elsewise
Aperture Center Corner
f/4 B B+
f/5.6 B A-
f/8 B B+
f/11 B+ B+
f/16 B+ A-
f/22 B B+
f/32 B B+
Notes: moderately high contrast throughout.
@ 200mm
Distortion: none
Vignetting: B+ @ f/4, A elsewise
Aperture Center Corner
f/4 B C+
f/5.6 A- B
f/8 A B
f/11 A- A-
f/16 B+ B+
f/22 B+ B+
f/32 B- B
Notes: moderately high contrast throughout.
@ 300mm
Distortion: slight waveforming with slight pincushioning tendency
Vignetting: B @ f/4, A- @ f/5.6, A @ f/8
Aperture Center Corner
f/4 C C
f/5.6 B- C+
f/8 B B-
f/11 B B
f/16 B- B-
f/22 B- B-
f/32 B- B-
Notes: moderately high contrast throughout.
*****
Tokina 80-200mm f/2.8 AT-X
OM-4T with mirror and diaphragm prefire
@ 80mm
Distortion: moderate barrel
Vignetting: B @ f/2.8, A elsewise
Aperture Center Corner
f/2.8 B+ B-
f/4 B B
f/5.6 B+ B
f/8 A- A-
f/11 A- B
f/16 A- A
f/22 B+ A-
f/32 C B
Notes: moderate contrast throughout.
@ 120mm
Distortion: very slight waveforming with no tendencies
Vignetting: B @ f/2.8, A- @ f/4 to f/5.6, A @ f/8
Aperture Center Corner
f/2.8 C C+
f/4 A- B
f/5.6 B+ B+
f/8 A A-
f/11 A- A-
f/16 A- B+
f/22 A- B+
f/32 B B
Notes: moderate contrast
@ 200mm
Distortion: None
Vignetting: B @ f/2.8, A- @ f/4, A @ f/5.6
Aperture Center Corner
f/2.8 B+ B
f/4 A- B
f/5.6 A- B+
f/8 B+ B+
f/11 A- B
f/16 A B
f/22 B B
f/32 B- B
Notes: moderately high contrast throughout.
Gary Reese
Las Vegas, NV
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