We were waiting for it, we were speaking about it, we were murmuring. Here it comes. Sony just let some information leak about their new super-tele-lens to complete an already rather rich list of good quality lenses:
The Sony 70-400mm f/4-5.6 G SSM is described in the PDF documentation of the Sony 70-300mm f/4-5.6 G SSM. Obviously, they were designed together. It is a twist-zoom. This will differentiate quite notably from the push-pull type of others like the Canon 100-400mm and it should protect it efficiently against dust entry (and we know that this is the bane of push-pulls.
The technical features can be read from this table. I can imediately notice that the diaphragm is staying between f/4 and f/5.6 (the golden standard of this type of zoom), that the weight is rather high (heavier than the Nikon and the Canon, nearly as much as the Sigma equivalnet) and that the minimum focus distance is very competitive.
Let’s wait for images and tests (and the price), but this could be the ideal lens to go and shoot in a wild-life safari.