I sent this to Ken by mistake, instead of the list. Joe
-----Forwarded Message----- From: KT Takeshita <[EMAIL PROTECTED]> Sent: Apr 6, 2005 8:16 PM To: Joseph Tainter <[EMAIL PROTECTED]> Subject: Re: [Bulk] Re: P-DFA 100mm f2.8 On 4/6/05 9:38 PM, "Joseph Tainter" <[EMAIL PROTECTED]> wrote: > "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 Here is the literal translation of exactly what was said in Japanese. "The flare spot (a kind of ghost) was "driven out" by the change of the optical formula. The basic optical performance should not have changed from that of FA50 f2.8" Ken
