[mst]

[quote name='Brightcolours' timestamp='1283464516' post='2439']

Disagree with what exactly, Marcus? I was talking about the width and the height of the AF sensor (and subsequent vertical and horizontal AF point spread).[/quote]



Yes, but many Canon cameras (starting with the 20D) use a diamond/rhombus shaped module that leaves out some important (to me) areas. The maximum spread may besimilar to the larger and more crowded AF modules, but the area covered is definitely smaller.



[quote name='Brightcolours' timestamp='1283464516' post='2439']

One small rectification: The D300 uses the same or similar AF sensor as the D3/700/D3x, but not the same module. Obviously, as it has an APS-C size mirror box, so at least the Af module optics have to be different due to the different distance.

[/quote]



I don't know if they are different or not, but they carry only slightly different names (MultiCAM 3500 DX for D300/D300s and MultiCAM 3500 FX for D700/D3/D3s/D3x).



However, the flange distance is the same for both DX and FX, consequently the position of the AF sensor is the same, too. They're usually in the bottom of the mirror box, illuminated by a secondary mirror right behind the main mirror.



-- Markus