Thanks Frank,
Trying to understand this ... the 4/3 lens is designed to go to a specific
position on command rather than focus in the chosen direction until told to
stop. The m4/3 camera can't give it a position to go to, only tell it to
stop when it gets there ... ?
That would be consistant with the noise it makes ... a series of
steps. When the 4/3 lens is on a m4/3 camera it can only make a series of
small steps. When the 4/3 lens is on a 4/3 camera it takes a large step,
then may take a smaller step to achieve focus.
Jeff Keller
On Wed, Jul 4, 2012 at 3:55 PM, Frank Wijsmuller <wijsmuller@xxxxxxxxx>wrote:
> >From what I've read it can't be addressed in software only. The motors in
> the lens are the key to this. In phase-optimized lenses, the motors and
> gearing is optimized to go to the calculated focusing distance in one
> (quick) go. Contrast optimized lenses have different motors and gears,
> enabling them to go fast forward and back in order to go where the contrast
> leads them. That is a different game.
>
> You might have noticed that although Canons new G1X sensor contained
> phase-optimized pixels, they still re-issued the 18-135mm lens with a new
> motor type. This could be an indication that the Canon
> coming mirror-less camera with a G1X sensor needs this kind of motor to
> achieve fast focusing.
>
> Best, Frank.
>
>
> 2012/7/4 List, OM <om-list@xxxxxxxxxxx>
>
> >
> > I doubt the m4/3 lenses contain any magic to get the quick focusing but
> the
> > 4/3 lenses sound like they are stepping towards focus rather than making
> a
> > continuous adjustment. I would bet the software in the OM-D just doesn't
> > recognize a 4/3 lens as something it knows anything about. If Olympus
> came
> > out with what they deem a professional m4/3 camera, they would probably
> add
> > the little bit of software it would take to make their high end 4/3
> lenses
> > work just fine.
> --
>
>
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