How is the OMD so fast

Started Jan 7, 2013 | Discussions thread
s_grins
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Re: How is the OMD so fast
In reply to rrr_hhh, Jan 7, 2013

rrr_hhh wrote:

s_grins wrote:

rrr_hhh wrote:

Notice the small, square posts with holes in the center that are set in the focusing ring. You can see four of them in the image above. We can lift the central part of the lens out of the housing now, which shows us the grooves in the focusing ring. Pancake lenses don’t have helicoids; the lens slides forward and backward during focusing because when the ring rotates, curved grooves inside move the lens backward and forward.

Also he makes it clear how the info is passed from the focusing ring to the processor : there is a dented ring inside of the lens which turns as you turn the focusing ring, passing in front of an optical sensor which transmist the info to the processor.

So well, the lens isn't activated by magnets.. at least not in the case of the two Panasonic pancakes lenses.

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rrr_hhh

I came to my conclusion based on the same excerpt. This is unconventional screw/nut engine. Just think about curved grooves as thread(s) and 4 posts as a partial stationary nut (helicoid)

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