[mst]

I'm wondering. Since I've close to no experience with focal lengths at 300 ('sides of the "soso" 28-300, which is crap at 300 mm) and above and am looking currently on "still no delivery date" on the Sigma 150-600, I start thinking about getting this new lightweight lens, maybe a 1.7× converter and save some 2 kg of weight.

I'm thinking in a similar way, I would prefer a 1.4 TC though. Add the 70-200/4 VR and you have a very versatile setup regarding focal length, but still rather compact. Plus the latest VR technology in both lenses. And you need to purchase that tripod collar only once

A shame, btw, not to add it as default accessory to the 300/4 VR... at that price.

However: I haven't seen the TCs mentioned anywhere in the press releases, so I'm not sure if the 300/4 VR is actually compatible with them. Anybody seen anything about it?

-- Markus