Just got a 35/2.8 from ebay. Like a dummy I didn't think t ask if the blades were slow or sticky this lens does tend to get them more than most combination weak spring and and oil. this seems to be a weak spring i.e. no visible oil. Just checked with the seller and he will refund though he said it worked fine on his NEX. I will say I got it about half what it usually goes for and getting it claed would put it at about what keh sells them for when they have them. Would you keep it see how it works cla when needed or send it back and keep looking?