Quote: yes I quite raise a brow whenever something from vietnam whether lens or any other product comes in
Quote: I don't simply jump or prejudge a particular product where it came from unless I saw some faults myself.
since you have thus far failed to prove it was the lens, you contradict yourself sir.
Quote: honestly speaking, in majority, if not all , a Japanese worker takes pride and dedication in his work compared to any other worker. that's a known fact unless you are unaware of it
a known fact? are you kidding? that is a broad opinion. no fact at all. and if it is, show me some evidence. seriously that is just ridiculous.
Quote: do you have proof that vietnamese assemblers are better or have equal assembling capability comapred to their hapanese counterparts?
no I cant prove they are better or worse. IT IS HAND ASSEMBLED. BY HUMANS. my point was that you CANT prove one is better than the other simply because its a pair of Japanese hands or Vietnamese hands. but what I do know is that Pentax would not have different equipment or training for the hand assembly of their top range lenses regardless of country of origin.
its QC, and things happen. do you know why you never come across or hear about a defective Takumar? (other than one that may have been damaged in use) because every single lens was tested.
every lens. at a cost that in part helped to drive down Asahi Optical's profits. modern QC doesn't allow for this, and thus bad lenses get out (of course the test did not prove that the lens was bad) they get out of Japan and every other country where lenses are made. we have had a few cases of the new K mount Carl Zeiss Z series of lenses (German hand assembled) having to be returned due to QC issues. most canon and nikon lenses and bodies are made in Japan, and guess what? all sorts of QC issues to be found.