






The new version of the 50-500 has OS whereas the original didn't. It is supposedly a tad sharper than the 150-500, but does cost more. However the 150-500 is a darn good lens I had mine for a few years with no complaints and would happily buy another.
Can't see why you'd need the 50-150 range

For things like this, absolutely no chance with a 150-500mm


AFAIK all the Focal Lengths of lenses are listed for a 35mm full frame (I'm sure someone will be along to say if it's different) even if they aren't able to go on a full frame camera. You get the same length on a crop body, you just get a smaller field of view which makes it look closer when viewed.
In other words, a 500mm on a crop would have the same field of view as an 800mm lens on a Canon crop and 750mm on a Nikon (I think they are 1.5x crops but I'm not 100% sure).
thanks for all the help !! is the hsm a must then ?? thanks