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Sony 200-600G focus is erratic


cbd
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I've been using the 200-600 on my a7iii for a few months. It was sharp as a tack - even handheld - until recently. Now, one day the subject will be sharp, the next day it will be so soft as to be nearly unrecognizable.  That happens handheld as well as on a tripod with all settings being the same. I tried re-seating the lens in the mount once and that seemed to help but not anymore. I treat it like a baby so there hasn't been any damage. My other Sony lenses are fine and dependable so it's not an issue with the camera body. I'm heading to Kenya soon and have to trust my lens.  Any thoughts on what's wrong and what to try before I send it to warranty repair?

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  1. Make sure that you have all the latest firmware for your camera. 
  2. Do you have a UV filter on the lens ? There was an issue that someone had with a UV filters that caused distortion on this lens, wondering if this could be an issue with certain lighting conditions and if that distortion affects how it focuses.
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