Downsides to 4/3 to m4/3 adapter? 43 to m43 adapter?

Started Mar 13, 2013 | Discussions thread
Klarno Veteran Member • Posts: 4,148
Re: Downsides to 4/3 to m4/3 adapter? 43 to m43 adapter?

babybunny wrote:

What are the downsides to getting the Panasonic 43 to m43 adapter?

AF is preserved.

How is video performance?

Four Thirds system lenses are designed first and foremost for a system using phase detection autofocus, and one where video is at best an afterthought. The motors in these lenses are not optimized for the kind of motion needed in a contrast detection autofocus system. With PDAF as used in any SLR, the camera is able to some degree to predict the direction and degree to which it needs to move the lens, which means it can use a high speed AF motor with low torque; whereas a CDAF mechanism has to figure out focus by trial and error, meaning it needs to be a high torque motor that can stop on a dime. I've seen some pretty poor AF reliability on some Four Thirds lenses when used on Micro Four Thirds cameras, simply because the mechanism is unable able to stop where and when it needs to.

Even the few lenses for Four Thirds which are designed to work well with CDAF don't focus as well as the most basic Micro Four Thirds lenses. The AF motors are noisy and slow for CDAF purposes, and the diaphragms are also noisy-- meaning they're also pretty unsuitable for video, unless you're presetting your aperture, using manual focus with a focus pulling mechanism, and recording your audio completely separately from the camera--putting yourself in the territory of a professional cinematographer.

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