Shel, this is reputed to have the same optical formula as the FA 20
f2.8, which I have.
Some time back Rob Studdert complained of corner softness at larger
apertures on the A. Wheatfield retorted that it is probably as good in
the corners as anyone else's 20.
I have to say that I don't see corner weakness on mine, even at f2.8,
where I use it a lot indoors. Maybe the optical formula of the FA
version isn't the same after all. Note, though, that this observation is
on digital.
If you go to Photodo, you will see that the FA 20 rates higher than the
offerings from Nikon, Canon, and Minolta. Only a Zeiss offering (IIRC)
rates better, but it costs several times as much. So I believe it is as
good as it can be at the price (which is not small for a new one). I
also think that the FA version is built just fine.
I am very happy with the lens. It is part of my standard kit.
Joe
