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Re: [OM] Lens Test: 250mm f/2 Zuiko (hold on to your hats!)

Subject: Re: [OM] Lens Test: 250mm f/2 Zuiko (hold on to your hats!)
From: David Brown <keswick@xxxxxxxxxxx>
Date: Fri, 28 May 1999 10:53:20 +0100
:) !


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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>


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