Mark K. Wilson
Ordered this lens based on the dozens of video an written reviews. Got mine today.... spent hours trying to figure out why it wasnt consistently sharp at any f stop. Tried to tune the autofocus on my D850.....the lens got worse. Went back to default. Hours wasted. More shooting... in studio, low light, outdoors. Not great results. Was it me? A pro with over 20 years experience? I picked up my D7000 with my trusty 17-55 2.8mm. Great results, always sharp. Okay, its not my eyes. I read a sticker on the box "This is a factory refurbished lens". Gee, thats odd.... seeing how I ordered and paid full price for a new one, not a discounted refurbish thats clearly got focus issues. Still on the fence about giving this lens another try.... hopefully with a brand new, issue-free lens purchased either here on in a store.