After only occasional use of the lens since August I have to correct my judgment.
2/3 of all images included in an extra run sets of tests are blurred. The error occurs sporadically, but then all series are not focused.
I have a suspicion. Often despite correctly latched objective the message "Focus Control" appears,
this is responsible for making manual focus on the aperture ring. That is the position AF does not work exactly. Unacceptable for a lens in this price range. Therefore, I have made my warranty claims asserted at Amazon and was expecting a defects free replacement product, since I do not accept a repair at this price and actually quality class. I will report as emanating the annoying process in a 900 product.
2. Supplement the review
TOP Service Amazon !!!!!!
After telephonic notification of the defect About averaging of Ruecksendeformulares with Note that repair is not possible. In parallel, a replacement lens has been sent.
Have this tested with several hundred photos, error has not occurred, images are perfect. Thus, my suspicion due to the error message seems to have so confirmed. Either a non-precise mechanical production or a fault in the signal connection. Now super lens, 4 stars due to lack of production quality.
