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09-19-2010, 12:12 PM   #16
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Doesn't canon have DC abbreviation for non-ultrasonic type motors?

09-19-2010, 12:17 PM   #17
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QuoteOriginally posted by ytterbium Quote
Doesn't canon have DC abbreviation for non-ultrasonic type motors?
Yes, they have "DC Micro Motor", although it isn't typically part of the lens name itself, as I recall.
09-19-2010, 12:19 PM   #18
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It looks very similar to Nikkor 18-135. Doesn't it? I mean the rings positions are the same, the spec are also the same...
09-19-2010, 12:32 PM   #19
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QuoteOriginally posted by elho_cid Quote
It looks very similar to Nikkor 18-135. Doesn't it? I mean the rings positions are the same, the spec are also the same...
Interesting, since this Nikkor is said to apply a "duo cam design (two extending inner tubes)". DC = duo cam?

09-19-2010, 12:39 PM   #20
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the ring is for the manual control fine tuning at Auto.
09-19-2010, 12:44 PM   #21
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QuoteOriginally posted by Kenn100D Quote
the ring is for the manual control fine tuning at Auto.
That still sounds a little cryptic I wonder if this ring is then going to be focus-by-wire.
09-19-2010, 12:53 PM   #22
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I hope it is a really good Sharp lens!
09-19-2010, 01:11 PM   #23
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QuoteOriginally posted by macTak Quote
Hmm. Note that the text says that the focus ring does not rotate on AF. Now, I don't have a Pentax SDM lens, but I know for the regular screw drive lenese the ring does rotate. I wonder if its the same with the SDM lenses and this is indeed a change (which would again indicate a new focusing design)
QuoteOriginally posted by macTak Quote
That still sounds a little cryptic I wonder if this ring is then going to be focus-by-wire.
I have a DA* 300 and the manual focus ring does not rotate when doing AF. I assume they are using that technology on the lens. The focus ring also does not stop when one side or the other maximum is reached. That being said, it sounds like they are taking that * feature and putting it into this lens.

------------------------

Why is this lens appealing? I guess it would be nice to have such a range at hand, but will quality be anywhere near a shorter zoom or prime I wonder?

09-19-2010, 01:11 PM   #24
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The rear focus ring likely means that the focusing elements are behind the zooming elements. This design seems common for modern wide-range zooms. Note Canon's 28-135/3.5-5.6, and 17-85/4-5.6, as well as Nikon's 28-300/3.5-5.6 and 24-120mm lenses.

"DC" could be anything, but here it does take the place of "SDM" in the Pentax grammar and the camera isn't mechanically coupled for focusing (as indicated by requiring a K100 Super or newer). I note that this rumor has it as "...WR DC" whereas Adam has it listed as "...DC WR." I also note that no Pentax SDM, non-DA* lens has WR, so there's no precedent for where the nomenclature should be expected. And, finally, I note that SDM lenses need WR more than screw-driven cameras.
09-19-2010, 01:20 PM   #25
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QuoteOriginally posted by sjwaldron Quote
I have a DA* 300 and the manual focus ring does not rotate when doing AF. I assume they are using that technology on the lens.
Thanks for that info. Yes, I then think it'll indeed be the same function. The DC probably then does indicate more of an SDM motor than the focusing ring control, providing that the DA* 300 has the same action of the focusing ring.
09-19-2010, 01:23 PM   #26
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If SDM is a name with too much negativity then it sounds logical for Pentax to come up with a new name. But in that case I find "DC" a little too unimaginative. Besides, as noted earlier, it is already used by Sigma. Oh well, we'll find out tomorrow!
09-19-2010, 01:27 PM   #27
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ok so if the focusing ring doesn't turn during AF, does that mean it can be manually turn infinitely to each side?
something doesn't sound quite right here
09-19-2010, 01:27 PM   #28
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QuoteOriginally posted by Asahiflex Quote
If SDM is a name with too much negativity then it sounds logical for Pentax to come up with a new name. But in that case I find "DC" a little too unimaginative. Besides, as noted earlier, it is already used by Sigma. Oh well, we'll find out tomorrow!
Heck, this lens has no less than 6 different acronyms in the name (counting the DA).
09-19-2010, 01:30 PM   #29
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QuoteOriginally posted by Pablom Quote
ok so if the focusing ring doesn't turn during AF, does that mean it can be manually turn infinitely to each side?
something doesn't sound quite right here
I only have one SDM lens: the SMC Pentax-DA* 55mm F1.4 SDM. And it does exactly what you describe. There's a distance scale, but the ring continues to turn when you reach either end (albeit less smooth than in the middle of the scale).
09-19-2010, 01:41 PM   #30
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Direct Clutch?
Direct Circular?
Diaphragm circle.
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