An alternative for the lens there is the focal length forth only for the few manufacturers. Of course it is very bulky and only manually adjustable with a fixed aperture, but it can be wonderfully adapted to all kinds of brands. One must of course be clear that such a focal length can not focus easily manually but un with a little practice the appropriate methods does the Best, but you should, if possible, take a stand now. For special applications, it is therefore necessary to use well for me, but not always to have a longer telephoto in a camera bag and to use fast times.
