It does excellent on nice bright days, if you have a jacked up image its your fault- I've figured that much out and with the ap. limits thats obvious. However I did take a couple shots on a very gloomy typical winter Wisconsin day and it still preformed decent...even at 500mm. I filled the frame with a couple ducks and blew up the image and was able to see sharp facial feathers, did it again on an otter accross the river, this time the otter was only filling 1/4 of the frame and I zoomed in on the computer and there was no detail at all....black/brown blob. But on the flip side I'd blame a lot of it on the lack of light rather than the lens. Low light = Monopod. Shooting hand held in low light is challenging and a PITA. Also keep in mind it is difficult to keep it "still" when at 500mm and can still produce "eh" images at high noon without a cloud in the sky with no OS/IS, you can however counter it to a point with a quick shutter or again-monopod.
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