after the poor luck with the used nokton lens, i ended up buying a new one. opened the box just now and found the lens to have faulty assembly. the barrel rocks back and forth at the aperture ring. was on the phone with photovillage and the guy asked me to tighten the screws around it to see if that fixes it but they are as tight as can be. second lens i have to send back but at least the replacement was fairly smooth. sigh. have to wait for another week now. fantastic lens though.