detritus
Senior Member
There was an unofficial comparison where usm failure rate is around 2 to4 % and 10% or so for sdm. Problems are sdm uses micro motor where others use ring motor. Also sdm die easily if you use manual too often. Please add salt where necessary.
u have been harping about sdm failure across so many threads and always hammering about the same point: it fails, it fails, it fails.
your evidence? anecdotal evidence from the vocal minority on the internet peppered with hearsay and rumours.
the most amusing thing to me: you do not even own a single SDM lens :bsmilie: