Actually it weighs exactly as much as a O40-150 2.8 and is smaller in size and quite cheap if bought used. Its sharp wide open and has a very nice rendering. The new Lumix 200 2.8 is way heavier and bigger and importantly way too expensive. The 180 is a full metal lens with a nice built in metal hood. Its slightly front heavy as were most Nikkor telephotos of its time, but balance is not bad on a larger body such as a GH5.Wonderful lens no doubt but I can only imagine how massive it must appear on a m43 camera.