Originally posted by blende8 The way Pentax introduced in-lens motors, was really bad.
These mini motors are just crap.
They are very slow and they fail often.
I have word from someone who knows this stuff, who disassembled his SDM lens and was shocked about the poor and cheap construction.
Only advantage is they are more silent.
Pentax is offering not even the minimum of support, namely the use of shaft AF in case the SDM is failing.
I wouldn't complain if they were using this in their budget lenses, but they are using it in their premium line!
Real robust ring motors please!
The main problem of SDM construction is weak material of driving gear.
It could be broken even during guarantee period.
Yes. It's from some kind of polymer plastic, but I don't understand
WHO prevents Pentax to change the supplier of components or change the material of details to more solid????