Sometimes I think I'd have no luck at all if it weren't for bad luck. I bought a "very good to excellent" 240 G-Claron on roll-the-dice-bay and there is no iris mechanism in the barrel. WTF? This is the first lens I've bought "in barrel" and I cannot believe this is normal or standard. Even though my expectations have occasionally been too high in the past (I expected my first marriage would last), am I wrong to expect the iris mechanism to be included? Please enlighten me.