<div id="linkdxomark">This a comment for <a href="http://www.dxomark.com/index.php/Lenses/Camera-Lens-Database/Sony/Sony-500mm-F4-G-SSM
">this page on the website</a></div>I own the Sony 500 and the Minolta 600mm lens. I was disappointed about he sharpness and focusing. I called Sony and they advised me to use the micro adjustment .
I tried to calibrate the lens in my 45feet living room .It was sharp focus only indoor but it was still not focus well outdoor so I re-calibrated to focus at my backyard tree which is about 150feet from the house. Now it is so sharp and as sharp as my Minolta 600mm or better.Hope to hear from you.