Hey guys, so I last friday got my O75mm the last one left in the store. :smile: It was late that friday, so i couldnt play with it till i got home, so it was dark and all. I played with it, after dinner, while on the table. and here where my problems come. every single review on this lens, almost no one said a bad word about it, other than is a "special" lens for its long FOV. But other than that, basically says the lens is almost near to perfection. so having that big expectations on it, noticed that my lens was hunting focus badly. to the point of not locking focus, missing it quite a lot and slow to focus. really slow. slower than my old P20. So i thought...hmm this is wrong. but didnt freaked out and waited to the next morning, where i took it out for testing in some sand castle competition in the beach near my place. grabbed the camera and though the lens sometimes still hunts, it was able to deliver some images, and certainly the best ones (in terms of IQ) ive got from any m43 camera-sensor-lens combination. period. also being a short tele, compresses the background a lot which brings that "FF´ness DOF and bokeh" we ALL thought it wasnt able to get with m43. This sand castle competition started at 12 o clock! so high contrast not smooth light...so i tried my best! this images are intended to be of this sort of review and doubts that i have more than "show-off" images. so bare with me. now i would like to share some 100% crops of the last two right!. so from these images you might say, well whats wrong with this lens. Nothing during daylight and here are my questions and concerns to make me believe that i might have a faulty copy of this marvelous lens. 1) Everytime i turn on my OMD with this lens mounted, it makes a "clank" sound that i dont get with any of my other lenses (panas or olys). 2) During low light, afternoon, or night, it hunts awfully, to the point of missing focus. several times. again, more than my P20mm during the night. 3) everytime i put my hand in front to test the focusing mechanism makes this weird electronic sound like a "tzzzzzz" sort of hum (which, no, is not the one from the IBIS) and does it every time i try to focus from short distance to something in the back. locking focus or not makes the sound. I already emailed the shop and they said that it was weird, but it could happen, and they would refund me, since they dont have more copies of this lens in stock, or wait till the end of next week. but i fly overseas the monday after. any experience...or is this normal "behavior"? any help is more than appreciated.