Rob wrote: RS> What I can say is that I believe RS> that the lenses open aperture sharpness seems to have more to do with ease of RS> focussing that I imagined. RS> The reason that I make this correlation is that I find the A50/2.8 macro more RS> snappy to focus than the A50/1.2 using the same screen and body.
You can try to focus the A 50/1.2 stop down to 2.8 and see if the apparent sharpness gain improves the ease of focusing. Anyway I just tried that with the FA 50/1.4 and I really can't see any difference, as I can't visually detect any change in sharpness between f/1.4 and f/4 - where the lens almost tops in sharpness without blackening the viewfinder. Yet I might have an explanation if you, like Tom, tend to focus on catch lights or other bright spots. The comma aberration for A 50/1.2 is huge at 1.2 compared to A 50/2.8 and significantly distorts the bright spots even at one third of the frame. Hence even if in focus, such small highlights don't appear as properly focused. Servus, Alin
