07-16-2013, 04:16 PM
freeradical wrote:
What's the point of an F4 lens at this focal length?
Why not just go with F5.6 and save about 10 pounds of weight.
In either case, it's only going to be used on a tripod.
AF speed, extra touch of shallow depth of field, 1 stop less noise, sheer awesomeness of that much glass.