Originally posted by sebberry
Pentax says SDM failures are not more common than other problems.
Pentax is just plain bald faced lying if they say this.
How many failures have we read about?
How many screw drive failures have we read about?
How many lenses have we read about that just fall apart in the users hands?
My own experience: I own some 4 dozen Pentax lenses and have been a Pentax user for 25 years.
In all this time, I've had 4 lenses that have needed service:
-An A50/1.2 that lost it's A contact.
Pentax tried to sell me a 43/1.9 instead of replacing it.
-An A100/2.9 Macro whose aperture went sluggish.
Pentax repaired it at great expense.
-A 6x7 Takumar 200/4 that I bought used and abused.
Pentax CLA'd it for a reasonable amount.
All three lenses were well of warranty and had been well used.
-A 60-250 which is less than 8 months old and has spent almost all of it's life in a camera bag.
Pentax can say what they like about SDM reliability.
They are LIARS if they say there are no reliability problems.