On 10/31/2012 1:00 PM, Frank Wijsmuller wrote:
> Standard 4/3 lenses require a 'mmf-1', 'mmf-2' or 'mmf-3' adapter. ...
>
> The OEMs will get you auto focus but *very* slow. Think 0,5 - 2 seconds,
> depending on the lens.
That's the info I've gotten from others, as well. Someone used to MF, and
perhaps a lot of pre-focus on suitable
subjects, may find AF with standard 4/3 lenses and adapter OK.
If one is used to AF with them on 4/3 bodies, or any other contemporary DSLR
AF, it will likely be painful, especially
in low light.
The problem is the change in AF technology. Lenses designed for the Phase
Detect AF used with focus screens don't work
well with the Contrast Detect AF necessary for non-reflex cameras. A couple of
other makers have started making combo
sensors with PDAF points built in, so their legacy lenses can be used.
µ4/3 has gone the other way, designing lenses from scratch for CDAF, which
gives better results and smaller, lighter
lenses.. In Oly's case, at least, it also makes them better for video, as it
involves designing small, light moving
elements for zooming and focusing and a different kind of mechanism for
focusing them. Combined with in-body IS, it
means little or no noise from zoom and AF to turn up in audio.
That's unfortunate in a way, as it means Oly can't simple port their previous
optical designs from their many 4/3 lenses
to µ4/3. OTOH, their µ4/3 lenses are excellent optically, while remaining
small and light. Part of the reason is, of
course, that most so far aren't fast. That's only a problem if shallow DOF is
important to you. The AF is really fast
anyway, and the high ISO good enough to compensate for lens speed for most uses.
A. F. Moose
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What if the Hokey Pokey *IS* what it's all about?
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