Originally posted by 8540tomg The Pentax SDM primes do appear to be more reliable than the zooms. Let me rephrase the question. I was actually curious if other manuafactuers AF motors are any more or less prone to failure than those supplied by Pentax. I suspect they share similar failure rates but some empirical data, if available, would be instructive.
I remember a post a while back from someone who either works for or knows the owner of a lens rental shop. This is the best I can remember, but I admit that I could be wrong.
All lenses, Nikon, Canon, Pentax, etc., has statistically similar failure rates, but the rate itself was rather high (15 % or something).
I think the problem is more with warranty. Pentax - 2, Nikon - 5. Canon's is worse, actually, but you typically see people here switching to Nikon, not to Canon (and vica versa, actually).
If the SDM lenses had a 5 year warranty, I think people would complain a lot less, een with the same failure rate.