^^ nice work Luke.
@simplistic, I just found out from another thread that my OEM focus screen can't show depth of field below 2.8 through viewfinder. So it is basically impossible to accurately focus at f1.4 through viewfinder. Unless you upgrade the focus screen that is.
I might try a new focus screen, but if not I'm going to have to use liveview for wide open, stopped down should be OK thru viewfinder.
If people here are finding that their results are often out of focus wide open, it is probably because of this.
Here's what member 'Wilt' said:
"The issue with dSLRs is that the focus screen has been purposefully made to be BRIGHTER and therefor less precise in its ability to show 'sharp focus'. This is because half of the light is already stolen from the viewfinder and redirected down to the AF sensor!
In film SLRs, all the light goes up to the viewfinder, so the focusing screen can be 'coarser' in its texture...which makes it more precise in depicting sharp focus. And since it gets all the light, it can be coarse-textured without the viewfinder being too dim to use.
So, with the dSLR standard focus screen, it is possible for the viewfinder to SEEM to be in focus, when it actually is not...which is when the Live View screen is a bit blurred.
When you focus first with Live View, the actual focus is sharp, and you can throw it a bit out of focus, and yet the focus screen in the viewfinder still seems to be 'in focus' (but the AF sensor is not fooled)
That is why Canon offers option screens, like the Ex-S screens which are advised for f/2.8 and faster lenses...it is a bit coarser (like the old film SLR focus screen) and it needs to be used with faster lenses so the viewfinder is not too dim."