« on: March 10, 2014, 08:59:04 AM »
I am from the old camp and like to be able to carry my equipment with relative ease, hence the 300f2.8mk11, with the 1.4 extender a superb 420mm f4 lens comparible to the 400mmf4 on a 200-400 lens. The 2 x extender gives you a very good and lighweight 600mm f5.6 lens with excellent image quality.
This versitile combination costs much less than both the 200-400mm and 600mm pairing. If you want further reach use a crop camera.
Yes but you use the 300 for its IQ and portability.
The 200-400 and 600 are different beasts altogether. And do not forget you can still put a 2X on a 600 and get great IQ at 1,200!!
Your point works very well too if you replace 300 with 400. But that costs a bit more.
I may be wrong but I doubt that those who buy a (or more) new US$12,000 lens put it on a crop body (1D MIV not included) but that is something else.