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02-11-2010, 02:14 PM   #1
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Pentax SDM II?

Patent US20090323208

02-11-2010, 02:53 PM   #2
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ooh, that would be much more promising than a micro motor
02-11-2010, 02:57 PM   #3
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not sdm

I doubt they will call this SDM anything, because A) Its using magnets not ultrasonic waves to move the ring, and B) SDM has alot of bad vibes with all the failures and such, so this would be a good opportunity to break with that nomenclature and start over. Looks good to me, though might be somewhat more audible than ultrasonics, but nowhere near as noisy as having to run a motor, reduction gear, and driveshaft, with more torque and less voltage required.
02-11-2010, 03:36 PM   #4
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Maybe it's some kind of new power zoom?

02-11-2010, 03:58 PM   #5
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Not at all,
simply to replace the the standard DC-Motor in camera with a more powerfull one with a smaller, more robust, gear. It is to reduce the size, by not using SDM, of the bigger (MF ?) lenses (or leave them the way they are). SDM has to hassle with high voltage isolation problems and low torque.

-Linus-
02-11-2010, 04:21 PM   #6
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Fewer moving parts, too, which should make for a more reliable system.
02-11-2010, 04:23 PM   #7
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Of course, it's all conjecture. For all we know, Hoya plans to use this in their Tokina line and leave Pentax with SDM. Or they don't intend to use it at all. Or they intend to sell it someone else.
02-11-2010, 04:29 PM   #8
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Tokina is a separate company, they would register patents under their own name.

02-11-2010, 04:32 PM   #9
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QuoteOriginally posted by Kunzite Quote
Tokina is a separate company, they would register patents under their own name.
oops, right, they just provide all the glass elements to Tokina
02-11-2010, 05:56 PM   #10
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Did I read it right.

It has both the ring magnet AF and a shaft drive for in body AF motor...
So they are still going to be doing dual action lenses??
Cool..
Of course you can ask "What's with Pentax not using ring USM???
02-11-2010, 06:26 PM   #11
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They may have just filed it to screw with people. If they did, its working!
02-11-2010, 06:49 PM   #12
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it appears to be working on me, but I'm more than happy using my primes right now. and they can go way faster than f2.8. although I would consider getting one for those occasions that I only have to use one lens. who knows, I might be a willing guinea pig.
02-11-2010, 07:14 PM   #13
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QuoteOriginally posted by Blue Quote
They may have just filed it to screw with people. If they did, its working!
Just got to hope Pentax releases a firmware for SDM if they will ever release this new AF system or not. Wouldn't want Pentax to discontinue their support for current SDM lenses leaving future failed SDM's a MF brick.
02-12-2010, 02:12 AM   #14
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Maybe we'll know more about this in 4 weeks...? (wouldn't surprise me if this is seen in the new 645 lenses first.)
02-12-2010, 03:09 AM   #15
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There's an interesting paragraph 0005, i believe, where it mentions that DC and ultrasonic motors have difficulty generating enough torque without high voltage and/or extra gearing.

Perhaps its a lesson learned from the SDM

The good news is that they now have a plan for getting out of this mudhole.
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