didnt optical lens designers lick astigmatism about 80 yrs ago? ----------------- J.C.O'Connell [email protected] -----------------
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Mark Roberts Sent: Monday, September 24, 2012 3:17 PM To: Pentax-Discuss Mail List Subject: Re: a legendary FA 35 f/2 AL... Bruce Walker <[email protected]> wrote: >Pentax literature points out how the final element of DA glass is >configured to direct the photons at right angles to the sensor to >compensate for the fact that the sensor is most sensitive to >perpendicular light. Film did not have this issue, hence FA glass (and >before) doesn't do this so the image will be fuzzier, especially off >center. > >My understanding is that all DA glass has been created with this >astigmatism compensation specifically with sensors in mind. Erm, this is nothing to do with astigmatism. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
