Your experience with the adapter agrees with Canon specs. Canon only
guarantees autofocus operation down to f/5.6 and even then only on the center
point which is more sensitive than the others.
Chuck Norcutt
> -------Original Message-------
> From: James King <jking@xxxxxxxxxxxxxx>
> Subject: [OM] Re: OM -> EOS focus confirm adapter
> Sent: Jun 15 '07 13:19
>
>
>
>
> Mike Lees wrote:
>
> > Has anyone any recent experience with these gadgets?
> >
> >
> <http://cgi.ebay.co.uk/AF-Confirm-Olympus-OM-lens-to-Canon-EOS-camera-adapter_W0QQitemZ170120675570QQihZ007QQcategoryZ30059QQssPageNameZWDVWQQrdZ1QQcmdZViewItem>
> >
> > If I remember correctly someone on the list had a poor experience with
> > something similar - have they improved any?
> >
> > Any opinions on this seller?
>
> I just brought one a little under a week ago.
> I don't actually own a digital camera but I tried it briefly (30 mins or
> so inside a room) with a collegues canon 400d and my tamron sp 90mm f2.5
> manual focus adaptal 2 lens. The adapter: firstly there is a screw which
> mates with the lever that stops then lens down. the screw on mine was
> not quite in the right place to move the stop down leaver all the way.
> Under f16 or f22 the apature closes correctlybut stop down to f32 and
> the appature does not close down firther. moving the leaver with a
> finger nail a little more correctly closes at f32. So I bent the screw a
> little and now it works fine. So check this out I guess it could be a
> problem with all the adapaters af confirm or not. So a little diy was
> needed but nothing major.
>
> To get the auto focus confirmation to work you need to focus wide open
> and rotate the focusing ring *very* slowly. A few experiments suggest
> that the focus confirmation stops working around f5.6. So I doubt if it
> would work with a f8 500mm mirror lens for example.
>
> If you rotate the focusing ring at normal manual focusing speeds you
> will never see the focus confirmation light go on at all. I did this to
> begin with and almost sent the adapter back saying it did not work. I
> found the easiest thing to do was focus looking at the focusing screen
> and then fine tune slowly looking for the autofocus conformation light
> and beep.
>
> On the 400d the amount you can turn the focusing ring each way and still
> get the confirmation light on is tiny with the tamron 90mm (I did not
> try any other lenses). From my limited experiences (assuming it is
> actually accurate) the AF confirm is better and more sensitive than
> trying to focus with the 400ds standard screen. The screen just does not
> snap into focus whereas on my om4ti with a olympus screen or beattie
> screen the 90mm *really* snaps.
>
> Essentially the adapter says that its a f2.0 Canon autofocus ef series
> lens set to manual focus
> Hope this helps a little
> James
>
>
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