Recently Rob Studdert wrote:
> 
> If the FA 20 mm f/2.8 and A 20 mm f/2.8 have the same optical formulations 
> (as per Boz's site) why then does the Pentax Screen-lens compatibility chart 
> indicate differing behaviour between these two lenses using the same 
> screens? Any ideas.

Hi Rob,

Can you give us a few more details?  Which screen is recommended for one
and which for the other?

Cheers,
Boz

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