I've been watching your photos for a while and I would like to ask how do you focus your target. I haven't used ever any tele-lens but I can imagine it's not easy to keep focused wild animals (actually any kind of animal). Also, I believe your camera doesn't have a classic focusing glass (I don't know how it's called in english but you surely know what I mean), so, how do you deal with the focus? what's the percent of images you discard because they are out of focus? do you use some kind of sharpen filter in photoshop?