Re: P-DFA 100mm f2.8

[Joseph Tainter]

"BTW, as I understand it, the triggering reason for redesigning these 
macros came from an innocent and casual report from a user of FA50/2.8 
macro/*istD who experienced a flare in the centre when used with a flash 
at close range at near minimum aperture.  This was apparently repeatable 
but never happened on film cameras.  So, Pentax immediately decided to 
eliminate this flare by minor changes in optical design."

Thanks for the extra information, Ken.
Do you know if Pentax changed the wonderful optical formula of the FA 50 
f2.8 or just added more coating?

Joe