At 18:32 24/04/99 +1000, you wrote:
>Jim wrote:
>
>>
>> Did you use Olympus' adapter setp up ring ?
>> If yes, did you use Olympus filter ?
>> If no, you should have used one of those
>> thin rimmed filters such as Hoya's Ultra
>> filters.
>>
>> This brings me the question of what aperature
>> does this lens (Zuiko 18mm/f3.5) show
>> vignetting with proper filter/step up ring
>> were used. Does anyone in the list have
>> experience ?
>>
>
>I have this lens with the Olympus step-up ring (lens hood).
>There is no perceptible vignetting using the step-up ring with a "normal"
>Hoya filter (adds 5mm extra length).
>
>The lens does have a fall off in brightness (appears like about 1 stop
>difference between the centre and the extreme corners), however this is a
>normal phenomenon for an ultra wide lens. There appears to be no difference
>at different apertures. See
>http://www.geocities.com/Paris/Louvre/6152/ct35-207-ac-a.html for an
>example.
>
>Let me emphasise: There is NO OBSERVABLE DIFFERENCE between the lens with no
>attachments and with the correct step-up ring and a Hoya filter with 5mm
>thick mount.
>
>Wayne Harridge
>Ivanhoe, Victoria, Australia
>http://www.geocities.com/Paris/Louvre/6152/
>
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Jim,
what you say is correct, "NO OBSERVABLE DIFFERENCE", because an OM camera
has a viewing area of 97% through the viewfinder. You dont always see
vignetting till you get the film developed.
Michael.
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