kaihp said:
The Mpix resolution should be a formula like 1/R_sys^2 = 1/R_sensor^2 + 1/R_lens^2. This type of formula show up when calculating bandwidth in electronic systems, so I presume that it is similar when calculating "bandwidth" of an optical systems. (Neuro will surely set me right).
I jotted in the numbers from DxOmark database for the 5D1, 5D2, 5D3, 5D4, 1DX & 1DX2, and giving some margin since DxO only reports integer values as result, the above formula matches pretty well with a resolution of around 50-55Mpixel for the lens. The resolution numbers for the 5D1 & 5D2 are the most off (70Mpix & 38Mpix) but this is where any rounding errors would show up the most.
From this, the 300/2.8 Mk II would be a ~100-200Mpix lens (lowest score is 98Mpix on the 50.6Mpix 5Ds. I'm suspicious of that 'data'point); other scores are above 134Mpix).
That's a lovely mathematical treatise, but I think we're getting wrapped around the axle and missing the bigger point.
If the 70-200 f/2.8L IS II data is to be taken at face value and that it needs to be improved for future higher resolving sensors,
all but six of Canon's lenses warrant that improvement to a greater degree.
So I am not saying you cannot improve the 70-200 f/2.8L IS II optically. I am saying you can improve dozens of other Canon lenses to a greater degree than that 70-200. So any decision to improve it before improving the other lens is for prestige / pride / price reasons more than actual 'optical necessity'.
- A