If you turn it all the way to the infinity end, it will focus a
little past infinity, making noise all the while. The ring will spin
endlessly, so there is no reference point.
The suggestion about turning the camera off and the lens goes to
infinity works well at 14mm on the small zoom, but is significantly
off at 45mm, and it seems to be pretty good at 40mm on the larger
zoom, but not too good at 150. I did testing on stars last night,
which is the most sensitive test there is. In focus stars are small
pinpoints, and out of focus become disks.
I read somewhere that the fireworks scene mode sets focus to infinity
- this is something I need to check out. But I would need to use a
different mode, so it would need to stay at infinity (if indeed this
is true) after being switched to another mode.
Ah, things were much simplier with manual lenses.....I put little
tick marks on the focus ring to line up with the infinity symbol for
those lenses (just a few zooms) that were not accurately at infinity
focus when on the factory supplied marks.
Don
--- Chuck Norcutt <chucknorcutt@xxxxxxxxxxx> wrote:
> Can't you simply spin the fly by wire focusing ring to the
> "infinity"
> end of its travel? I just tried that with my A1 and it works fine.
> The
> ring keeps turning but the distance reading on the screen stays at
> ininity. Perhaps you don't have a focus distance readout anywhere
> but
> you can probably experiment and discover that, for example, if you
> turn
> the ring at least one full turn you're at infinity.
>
> I went to try the same thing with the 5D and Tokina 28-80
> forgetting
> that the Tokina has a distance scale and an infinity mark and a
> hard,
> mechanical stop when in manual focus mode.
>
> Chuck Norcutt
>
>
> Bernard Frangoulis wrote:
>
> >> The zooms included with the E-500 kit do not have any focusing
> >> marks and no infinity mark. With the focus by wire control in
> >> manual focus, there appears to be no way to precisely preset the
> >> focus to infinity, or any other value. I sometimes need to
> focus
> >> at infinity in situations where the autofocus cannot sense the
> >> focus (night sky for instance). Anyone have any suggestions I
> am
> >> not aware of?
> >>
> >
> >
> > Switch off the camera - this should reset the lens to infinity (I
> > think, not 100% sure); then switch it back on, and set focusing
> to
> > manual so that the focus stays where it is.
> >
> > Bernard
>
>
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