Joe, you're stating things so much simpler than I do ... On Tue, Jul 28, 2009 at 10:38 PM, Joseph McAllister<pentax...@mac.com> wrote: > If my EXIF says the lens is "either a SMCP-FA 28-85 or a Sigma 28-105", then > I know it was my Tokina AT-X Pro 80-200 ƒ2.8. > > Simple as that... :-) > > (this is a true story) > > On Jul 28, 2009, at 13:31 , Thibouille wrote: > >> The only official of doing this is OEM providing the code which means >> 3rd parties do 'cheat': they either use (yet) unused codes (which may >> create future problems) or clone codes from supposedly equivalent OEM >> lenses (like if Sigma 18-55/2.8 used DA16-50/2.8 code). >> >> In the end, the only way to be sure of anything is to use OEM lenses >> and no theird party lenses (hum...). >> >> Even if a code is used only by a third party, a software provider >> (say, Adobe) may or may not want to take it into account. >> >> In the end, some lenses are recognized perfectly, some are recognized >> as something they are not (at all) and some are never recognized at >> all. >> OEM lenses always end up being recognized. >> >> Anyone who wants to fiddle with codes can: >> >> * open an EXIF from e.g. DA60-250 with an EXIF viewer, >> * note the corresponding code, >> * find the correspondance table in the target software, >> * edit the table to reflect the correspondance betwwen code and lens name. >> >> AFAIK, the focal length is always OK, just the lens name which is >> tricky. You probably do not want your Sigma lens to identify itself as >> a Pentax lens, specialy if you're comparing the two lenses deciding >> which one you need to keep :o >> >> This is all really a simple stupid thing but it may have consequences. >> IMO anyone interested in this should always check how a third party >> lens idetifies itself as to minimize confusion. > > Joseph McAllister > pentax...@mac.com > > http://gallery.me.com/jomac > http://web.me.com/jomac/show.me/Blog/Blog.html > > > > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. >
-- Thibault Massart aka Thibouille ---------------------- Photo: K10D,Z1,SuperA,KX,MX, P30t and KR-10x ;) ... Thinkpad: X23+UB,X60+UB Programing: D7 user (trying out D2007) -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
