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12-09-2010, 12:31 PM   #1
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What's the deal with SDM?

Been away from the forum for a while...

I was thinking of getting a 50-135... which previously was pretty much "best zoom ever." But now I'm reading all this bad stuff about SDM, and how it basically has a 100% failure rate and I'd have to be crazy to buy a DA* lens.

Maybe I should get the DFA100WR instead. Macro to boot...

Comments?

12-09-2010, 01:46 PM   #2
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SDM doesn't fail any more- it's a thing of the past!

Adam
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12-09-2010, 02:06 PM   #3
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The failure rate is not as high as it was initally. The in-lens motors are still slightly less reliable then slotted driven Fa or DA limited lenses but IMHO not less reliable anymore than the competition.
I'd buy SDM without hesitation, it's the only way to achieve precise focus on wide apertures (like Da*55 makes much more sense than FA50).
12-09-2010, 03:48 PM   #4
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Camera Lens Rentals response to question about SDM

I've posted this before, but it fits here, so I'll post it again.

My question on Nov 4 this year to Camera Lens Rentals:
Have you found the Pentax SDM lenses to have higher failure rates than other Pentax lenses and lenses of other brands?
Their response the same day:
The only problem we have ever had with a lens was when the 50-135's first came out. That was all been resolved at that time, and have not had to send in any lenses for repair to to being non-functioning from the Pentax line. We have had to send in for scratched lenses or damage from a drop only.
Jeff

12-09-2010, 03:57 PM   #5
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Bad news finds it way onto the internet very rapidly, much faster than the good news.

Which is, my 50-135 works perfectly and always has done.
12-09-2010, 04:34 PM   #6
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LensRentals published figures on the failure rates of all their lenses (Nikon, Canon, Sony etc but no PEntax unforauntely). The median annualised failure rate for a lens was 5.5% (some lenses like a couple of Sony ones were 20%). Whether SDM lenses are down around the median now is unknown as no figures have ever been published. I suspect though that the rates are getting down to that median though as the reports of failure are getting infrequent now, and I notice a large number of people here owning multipple DA* lenses.
12-09-2010, 04:47 PM   #7
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I wait for another 2 years to see if nothing comes up regarding any future SDM failure. then I'll make a decision whether to get one.
12-09-2010, 07:56 PM   #8
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Well, it sounds like there are still at least a couple functioning SDM lenses out there Darnit, I need some way to narrrow down which lenses to buy!

12-09-2010, 10:03 PM   #9
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QuoteOriginally posted by sewebster Quote
Been away from the forum for a while...

I was thinking of getting a 50-135... which previously was pretty much "best zoom ever." But now I'm reading all this bad stuff about SDM, and how it basically has a 100% failure rate and I'd have to be crazy to buy a DA* lens.

Maybe I should get the DFA100WR instead. Macro to boot...

Comments?
The failure rate is not 100% or even close to it. Plus, if it failed (early enough) it would be fixed under warranty and you'd have a nice nice repaired lens.

If you are undecided about a 50-135 vs a 100 macro, you should do more research :-)
12-09-2010, 10:23 PM   #10
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QuoteOriginally posted by SpecialK Quote
The failure rate is not 100% or even close to it. Plus, if it failed (early enough) it would be fixed under warranty and you'd have a nice nice repaired lens.

If you are undecided about a 50-135 vs a 100 macro, you should do more research :-)
Yeah, there was a generous helping of hyperbole in my original post
12-10-2010, 02:53 AM   #11
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This thread has helped me a bit. I'm about to buy some new Pentax lenses (coming from Canon Ls) and the 50-135mm was high on my list. I got a bit worried when I heard about the SDM issues, but perhaps that is not such a concern anymore.
12-10-2010, 03:37 AM   #12
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i want this lens too, but cant decide if to buy the new sigma 70-200 OS first

i wouldn't worry about the SDM failures too much..Id say that pentax have applied a ongoing production fix to that one..my biggest complaint is , that there are so many great lenses that I want,,but limited funds to buy them
12-10-2010, 04:09 AM   #13
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I got a DA*60-250 on it's way (well that is if Prodigital-2000 ever ships the damm thing) and want to replace all my zooms with DA*'s so I am REALLY hoping that the SDM issue is over and dealt with.

Of course with my usual luck if there is one bad DOA lemon 60-250 in Canada, I'll get it.

Pat
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