From Gary Reese's lens tests:
------------------------------------------------
OM-1 with mirror lockup
Aperture Center Corner
f/3.5 C C
f/5.6 B B+
f/8 B A-
f/11 A- A+
f/16 B A
Notes: Vignetting characteristic of wide angle lenses, improving with
stopping down; moderately high contrast images; remarkable lack of
distortion; lens design emphasizes outer zones at expense of center image
zone (which gives a sharper overall impression of an image); overall
optimum aperture at f/11. A 10- condition sample.
-------------------------------------------------
But this same contention was not supported on a second sample shot with
OM-2000 and pre-fire. There the center was B+ and the edge B. But
still good relative performance at the edge.
Chuck Norcutt
Andrew Fildes wrote:
> As I remember, It's the centre that's not so sharp on the 18mm.
> A bit of cute design to mess with viewer perception.
> Andrew Fildes
> afildes@xxxxxxxxxxxxx
>
>
>
> On 24/01/2009, at 7:29 PM, iwert bernakiewicz wrote:
>
>> I was processing architecture images from the 18mm zuiko on the 5D
>> yesterday and I am still amazed by the sharpness and details, till the
>> very most corners. I'll post some later, I really can't believe this
>> statement anymore after what I saw. My 18mm OM is definitely sharper
>> than my 7-14 zuiko, but that could also be sample variation.
>
--
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