The very fact that you have asked the questions you have; means that I would never buy anything from you. Someone who appears to not be a trained technician; poking around in the innards of a camera or lens is not a good omen. I have done a large number of modifications to photographic equipment for various reasons but when I do that, the item (as far as I am concerned) cannot have the integrity to allow it to be used by anyone else as the expectations may not be met. I also know what I am doing and have the ability and equipment to measure resolution etc. in microns. I recently was stung by a subscriber on a purchase and for personal reasons I was not able to use the Paypal 45 day policy. The seller lied about the condition of the item and has no integrity. I am pondering how to react to the situation.