Aren't there two different factors at work here Thomas? I am no longer sure
of the definition of vignetting, so avoiding that term, the two factors are:
1 Shadows in the corners of the image caused by the filter
2 Image fall-off in the corners due to the difficulty of even
illumination across wide-angle lens field.
The first will be made worse as the aperture is stopped down, and/or as the
subject is closer to the lens, due to increasing depth of field.
The second will, conversely, be made worse as the aperture is opened up.
Take your pick! My pick would be for an oversize filter with stepping ring
- have you ever seen a thin circular polarized for a price which compares to
the lens its mounted on?
Piers
-----Original Message-----
From: owner-olympus@xxxxxxxxxxxxxxx [mailto:owner-olympus@xxxxxxxxxxxxxxx]
On Behalf Of Thomas Heide Clausen
Sent: 07 August 2003 13:24
To: olympus@xxxxxxxxxxxxxxx
Subject: Re: [OM] my 21/3.5 pictures
On Thu, 7 Aug 2003 14:57:36 +0200
Markus Haukeboe <markus.haukeboe@xxxxxx> wrote:
> Hi
>
> I was in Greece one week ago, and for the trip bought a circ polarizer
> for my 21/2.0. I found this extra slim line of Hoya filters, and as
> far as I can judge, this is not viewable in the pictures. The
> disadvantage is that the slim design does not allow for filter treads
> on the front of the filter, so I cant use any front cap.
Markus, did you use your 24/2 fully open? I have a 24/2 and a Hoya extra
slim filter, and if I go to f/2.8 or f/2.0, I do get vignetting on my
photos. Of course, Greece at this season is not really where you would
expect using a wide angle fully open ;)
Either that, or Hoya has made a slim polarizer, even slimmer than the one I
have...must investigate....
--thomas
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