I recommend several professionals: friendly young folks who are knowledgeable in their field. Regarding the lens itself, I have opened the packaging, gone through everything, and can assure you that everything is in excellent working order. In addition to that, they provided instruction on how to use Some cons: Even in the winter, I would not recommend driving to the store. The only exception to this rule is if there is a restricted parking lot close (the second one, if you are unlucky). The very center, but still within walking distance of the subway)