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03-23-2015, 02:59 PM   #286
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Note that thes pictures are extracted from a larger aticle which describes how to fix a 16-50 sdm :
http://www.soomal.com/doc/20100003594.htm
it is in chinese but the pictures speak for themself
Hopefully the nylon gears have been strengthen in the DA*300

03-24-2015, 03:37 AM   #287
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Just looking at the Pentax UK website, and the availability has changed from "Available March 26th" to "Shipped as soon as in stock"

That says delay to me.
03-24-2015, 04:40 AM   #288
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QuoteOriginally posted by thegoderic Quote
Just looking at the Pentax UK website, and the availability has changed from "Available March 26th" to "Shipped as soon as in stock"

That says delay to me.
or too many orders to fulfill at the 26th. Overhere its expected medio april
03-24-2015, 05:01 AM   #289
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QuoteOriginally posted by goubejp Quote
Note that thes pictures are extracted from a larger aticle which describes how to fix a 16-50 sdm :
http://www.soomal.com/doc/20100003594.htm
it is in chinese but the pictures speak for themself
Hopefully the nylon gears have been strengthen in the DA*300
I'm sure it's not the nylon gears, its the motor on top. The photos show that the screw drive feeds in from right and the tiny micro motor via the left into the nylon gears that then drive the focus mechanism.The solution was to install a more powerful SDM motor (from various tidbits on the web) This would cause more failure of nylon gears if that was the problem.
The SDM failure is characteristic of motor burn out, a broken gear would create a loud noise as the mechanism slips and hits. It would be sudden and complete, not the slow death seen in SDM failure. From the looks of it to replace the SDM motor requires pulling out the motor and gear assembly to reach an screw that holds the motor and its nylon drive gear in place. Kind of hard to tell what their doing when we cant speak the language though

03-27-2015, 12:12 AM   #290
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The release date for the 150-450 has slipped to April 17:

QuoteQuote:
Ricoh Imaging March 27, the release date of "HD PENTAX-D FA 150-450mm F4.5-5.6 ED DC AW" and "HD PENTAX-DA 18-50mm F4-5.6 DC WR RE" of Pentax interchangeable lenses I decided to April 17. Small clip-on strobe "AF201FG" also released in April 17.
http://dc.watch.impress.co.jp/docs/news/20150327_694933.html
03-27-2015, 01:23 AM   #291
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QuoteOriginally posted by robjmitchell Quote
I'm sure it's not the nylon gears, its the motor on top. The photos show that the screw drive feeds in from right and the tiny micro motor via the left into the nylon gears that then drive the focus mechanism.The solution was to install a more powerful SDM motor (from various tidbits on the web) This would cause more failure of nylon gears if that was the problem.
The SDM failure is characteristic of motor burn out, a broken gear would create a loud noise as the mechanism slips and hits. It would be sudden and complete, not the slow death seen in SDM failure. From the looks of it to replace the SDM motor requires pulling out the motor and gear assembly to reach an screw that holds the motor and its nylon drive gear in place. Kind of hard to tell what their doing when we cant speak the language though
Rob, the SDM is a piezo-electric motor, so "burnt out" gives the wrong impression of the failure. It's not like an electromagnetic motor where coils carry currents, which can overheat and literally burn. Having pulled my 16-50 SDM drive apart more times than I care to recall, I can tell you that it jams at one extreme of movement, and will free up with the application of a modest amount of wrist action via a Philips head screwdriver on the shaft, but in the finish they just keep jamming at shorter intervals (I converted my copy to screw drive when the degree of frustration just got too much). I suspect the culprit is distortion of the piezo elements, but I haven't actually pulled the motor itself apart to test that theory. I really doubt the replacement motor has that much more torque than the original, to the extent that it would strip the plastic gears in the drive train. I'd be more leaning toward misalignment in the repair job, or bearing wear, but I'd be happy to be corrected by someone with design experience in the specific area (mine's been in somewhat larger gear trains!).
03-27-2015, 01:32 AM   #292
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QuoteOriginally posted by rawr Quote
The release date for the 150-450 has slipped to April 17:

http://dc.watch.impress.co.jp/docs/news/20150327_694933.html
I read they need more time to refine the product. OK, better that than rushed to market I guess... I'll wait one more month then.

Wim
03-27-2015, 01:39 AM   #293
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I just hope the new lens focusses much faster. The DA*300 is driving me a little crazy with the number of shots I miss. It's wonderful when it does focus, but aggravating when it doesn't!

03-27-2015, 02:26 AM   #294
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QuoteOriginally posted by rawr Quote
The release date for the 150-450 has slipped to April 17:


http://dc.watch.impress.co.jp/docs/news/20150327_694933.html
I don't think it's quite true to say the release date has slipped. No Japan release date has been mentioned at all until today - it has just been "soon". This report is saying that a release date of April 17 has finally been set for the DFA 150-450, the HD version of the 18-50 and the small flash. Unfortunately, a release date for the 70-200 was not mentioned. That's the lens they are saying is delayed.

Last edited by JPT; 03-27-2015 at 02:36 AM.
03-27-2015, 02:39 AM   #295
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QuoteOriginally posted by Stavri Quote
I've read posts from those who have tested the 150-450 at CP+ stating that the side buttons are programmable, you can set them so that when you press the button the lens quickly focuses at infinity (or close distance) acting very much like a programmable focus limiter.
That is correct are a few buttons in this sense..hehe
03-27-2015, 03:33 AM - 1 Like   #296
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You can see the size in my hands here, and the button layout!
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03-27-2015, 04:20 AM   #297
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QuoteOriginally posted by kenspo Quote
You can see the size in my hands here, and the button layout!
moar lens porn!

Plus - do those AF lock (or whatever) buttons actually do anything on the K-3?
03-27-2015, 04:41 AM   #298
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QuoteOriginally posted by kenspo Quote
You can see the size in my hands here, and the button layout!

That's not a lens that's a blender with a very tall base. I suspect a heavy duty motor; it will blend anything!
03-27-2015, 05:08 AM   #299
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QuoteOriginally posted by cxdoo Quote
I suspect a heavy duty motor; it will blend anything
On the subject of blending things, the bokeh on this lens looks noticeably better than the Sigma 100-300mm f/4 APO EX DG.
03-27-2015, 05:31 AM - 1 Like   #300
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QuoteOriginally posted by cxdoo Quote
That's not a lens that's a blender with a very tall base. I suspect a heavy duty motor; it will blend anything!
"The only blender which can be turned into the most powerful vacuum cleaner!"

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