16 elements in 12 groups, 82mm filter (roughy the front element diameter) vs 13 elements in 8 groups, 77mm filter for the 50mm f/1.4
The 50 is 0.8kg so with a bigger front element and more glass ...
The 40 is also much longer (131mm vs 100mm).
BTW, the MTFs are clearly substantially superior compared to the 50 ...
The 50 is 0.8kg so with a bigger front element and more glass ...
The 40 is also much longer (131mm vs 100mm).
BTW, the MTFs are clearly substantially superior compared to the 50 ...