I really wanted my ZR experience to be the best, after all, the glass is like 90% or more of the alphas, at 1/3 the costs. When the third pair arrived and even after ZR themslves said 1/4" slop in the focus knob of a brand new pair is too much, I realized the problem is Chinese quality control. The third pair I owned which was the second replacement pair had about 1/8" slop in focus knob I just couldn't risk what happened with the very first pair, they seized up while on a hunting trip. I bought a pair of German made Minox and the mechanical build is at least 2x that of the ZR, I know even though the Minox is only maybe 2% behind the ZR in glass quality (we do not know long term yet for sure on the glass, coating life etc.)I won't have to worry about a failure in the field. I will never knowingly buy anything from China I really need to depend on. I will say ZR customer service was great, as the fact is they did indeed have a lot of problems early on with the focus knobs, this is easily verifiable. Like I said *I really wish I could have bought a 90% alpha for $400.00!* It didn't work for me.