>Hmmm. What does "quite good" means? If it isn't very sharp wide open then
>I'm not interested.
>I got a private answer that says that this lens best aperture is wide open,
>and that optical quality actually deteriorates when stopping it further
>down!
>It makes sense to me to design a 400/5.6 to perform at its best wide open.
>After all, that how most people are going to use it.
I remember I read similar comment in Popular Photography before. The optical
performance seemed to degrade as you stop down.
regards,
Alan Chan
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