Yes, I found exposure shift in liveview mode, it is around 1 stop max., may
depends on lens and lighting condition but I don't see 3 stops different you
mentioned. Just checked the OM50-250 again, it is 1/3 stop under with
liveview at all focal lengths.
Concerning the difference from F1.4 to F2, I still think it is mainly for
compensate the light fall off. I tried average metering on 5D II, it is 2/3
stop off and in spot mode it is only 1/3 stop off. With the E-PL1 it is also
1/3 stop off, from F2 to F8 it is 1 stop apart each, there is possible off
say from F2 to F2.8 but less than 1/3 stop so can't show on the meter.
OM doesn't need to know the absolute aperture since it doesn't need to pass
aperture information on screen or anywhere.
C.H.Ling
----- Original Message -----
From: <usher99@xxxxxxx>
> Thanks Moose and Carlos. Good to know it really is a 1.4 lens. Seems
> there still is an OM mystery with the odd short step from widest
> aperture to next step. Also weird that Canyon FD needs to know the
> absolute aperture and OM doesn't.
> Putting the lens on Dslr's seems to create more mysteries than it
> solves. On 5DII with live view exposure simulation mode the live
> histo is waaay off while metering through the VF in Matrix mode is very
> very close to spot on ---different than 5D classic AFAIK (VF metering
> only available of course with accuracy only reliable wide open). I
> likely should have taken it off
> Matrix metering but didn't think of it in my hurray. Didn't even get
> to the relevant question. Jeff seem to find this behavior as well,
> though CH
> has not mentioned it as an issue. I queried Canyon on the odd
> behavior, but as expected they don't give a rat's arse about non system
> lenses
> use on it and said so. A Canyon lens is within a third of a stop in
> either metering technique.
> The 50 F1.4 sn >1.1X10**6 is still happy on my OM and I used it last
> week. It was the first thing I bought when I joined the list and
> learned about it. Best 50 bucks I ever spent.
>
> Mike
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