:) !
At 02:04 28/05/99 EDT, you wrote:
>Folks:
>
>This lens is so exceptional I had to post the results right to the list. I
>couldn't believe my eyes! Let the data and summaries speak for themselves.
>And don't miss what happens when you shoot with an OM-1n instead of a OM-4.
>*********
>250mm f/2 Zuiko (multi-coated)
>Vignetting = C @ f/2, A- @ f/2.8, A @ f/5.6
>Distortion = None
>
>OM-4 w/ mirror and aperture prefire via the self-timer
>Aperture Center Corner
>f/2 A B+
>f/2.8 A+ A-
>f/4 A+ A
>f/5.6 A+ A+
>f/8 A A-
>f/11 A- A-
>f/16 A- A-
>f/22 A- B+
>Note: Extremely high contrast and resolving power at all apertures with only
>a minor loss in the corners at f/2 and f/22. Strong vignetting at f/2,
>requiring exposure compensation for critical work. Clearly one of the best
>Zuikos made. Brillant images, with f/5.6 showing a corner to corner clarity
>unsurpassed by any Zuiko tested to date.
>
>OM-1n with mirror lock-up and self-timer
>Aperture Center Corner
>f/2 D C
>f/2.8 D+ C
>f/4 C C+
>f/5.6 B- B-
>f/8 B- B-
>f/11 B+ B
>f/16 C+ C
>f/22 B- B
>Note: Combination of vibrations from the auto diaphram mechanism and the
>horizontally traveling shutter of the OM-1n results in significant image
>deterioration, despite secure tripod mounting the the lens bracket. Note
>that differences between this test and the one above with the OM-4 are
>significant at the 1/3 grade level based on side by side comparisons. Test
>conditions were identical and used the same lens.
>
>250mm f/2 Zuiko with Olympus 1.4x teleconverter (both multi-coated)
>OM-4 w/ mirror and aperture prefire via the self-timer
>Vignetting = C+ @ f/2, A- @ f/2.8
>Distortion = moderate pincushion
>Aperture Center Corner
>f/2 (2.8) A- B
>f/2.8 (4) A B+
>f/4 (5.6) A A-
>f/5.6 (8) A A-
>f/8 (11) B+ B
>f/11 (16) B+ B
>f/16 (22) B+ B-
>f/22 (32) B- C+
>Note: Moderate to moderately high contrast. Exceptional wide open
>performance.
>
>250mm f/2 Zuiko with Olympus 2X teleconverter (both multi-coated)
>OM-4 w/ mirror and aperture prefire via the self-timer
>Vignetting = D? (distinct central hot spot) @ f/2, B @ f/2.8, A- @ f/4
>Distortion = slight pincushion
>Aperture Center Corner
>f/2 (4) D C
>f/2.8 (5.6) B C
>f/4 (8) B C
>f/5.6 (11) B- C
>f/8 (16) C C+
>f/11(22) B- C+
>f/16 (32) C C
>f/22 (44) C C
>Note: Not an Olympus recommended combination. Unusable at f/2 (effective
f/4)
>due to low contrast, poor resolution and hot spotting; moderately low
>contrast at f/2.8 to f/4 (effective f/5.6 to f/8), moderate at f/5.6
>(effective f/11) and beyond.
>*******
>
>Gary Reese
>Las Vegas, NV
>
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