We already discussed this. The reason some of the DA lenses are working better than the FA counterparts is they are reformulated for narrower angle of coverage (APS) and hence can be improved in the limited area they do cover. this is simple classic optical design because you dont need as many optical elements to cover a narrower angle (at same focal length). I do to agree that it has anything to do with new technical advances or glass formulations. This is simply lenses designed for the format and it pretty much proves my earlier contention that the larger the format, the lenses are not as absolutely as sharp. ie. DA can be made typically sharper than FF lenses, 35mm FF lenses typically sharper than medium format lenses , medium format typically sharper than Large format lenses, etc. This is not to say the smaller formats overall system resolution is better, its actually worse in spite of sharper lenses and my further contention is that many if not most Pentax FF lenses can/will provide better overall picture quality than any DA/APS combination possible due to the larger, FF format. (they only need 2/3 the resolution of the best DA lenses to match them, anything greater than 2/3 is going to beat them)
jco -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of William Robb Sent: Wednesday, February 07, 2007 4:33 PM To: Pentax-Discuss Mail List Subject: Re: NO FS this Friday? ----- Original Message ----- From: "Tim Øsleby" Subject: RE: NO FS this Friday? > If I filter out the insults in this post I tend to agree. There is > nothing wrong about the legacy lenses, except a limitation or two. > Why do we assume that the latest toys are the best toys? Because we are > told > they are. If I could find affordable classic lenses, I'd buy them without > hesitation. In the context of Pentax camera equipment, newer lenses benefit from technical advances in optical design and glass formulations. I haven't done any objective testing (the swimming pools around here are frozen over) of the DA lenses that I own vs. the K/A/FA lenses that I own in similar focal lengths, but my objective opinion is that the newer lenses are working better on digital than their older counterparts. William Robb -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
