Originally Posted by Addy101
By definition a f/1.4 lens needs more glass then a f/2.8 lens and will therefore be bigger.
To give you an idea:
The Leica Summilux-M 35/1.4
is 46mm long and has a 56mm diameter, weighing 320gr.
The Leica Summarit-M 35/2.5
is 33.9mm long and has a 51.4mm diameter, weighing 220gr.
I wouldn't mind a 35/1.4, but Sony has more important gaps, like a wide (28/24) lens.
I understand why the lens would need to be larger in diameter (though I feel the 35FE is so wide for aesthetic reasons--sitting flush with the mount). But why must it be much longer? I suppose this could be answered by optical physics for dummies. I guess I don't know exactly in what situation the literal focal length of a lens dictates the fov among other qualities. There are so many designs that seem to negate that idea.