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Message: <blockquote data-quote="Fozzybear" data-source="post: 1442158" data-attributes="member: 69297">Definite improvement with an adjustment to the af fine tuning. Need to experiment more with the settings but with the slightly brighter light (albeit still raining and dull/cloudy) and a bit of practice results are getting better. Took this handheld shooting through my double glazed kitchen window (knew the blue tit wouldn't stay there if I opened the door!) and cropped in about 1/3 to 1/2. Even so, detail and focus are not at all bad bad. I under-exposed the shot so noise is high and the detail would be better if I hadn't shot through two layers of grubby glass but am feeling a bit more that this could be a good lens. Colour fringing is certainly well controlled, I had to look very closely to see any here.I had a LOT of focus correction dialed in though, I may need to get the lens calibrated but really need to do some in-depth test shooting in bright sunshine really to work out out properly... hopefully will get some sun tomorrow.</blockquote>