Very simple: Tokina 'hacked' the Pentax 35-70 code and used it. Sigma does/did the same btw, my 28/1.8 being identified as a Pentax 28/2.8 (funny as I shoot @1.8). The lens ID is given by the lens to the body.
The K5 will NOT itself apply any lens correction because the K5 can do so only for DA and FA Limited lenses. Lightroom, though may do *IF* it has an associated profile (fot the Pentax 35-70 lens), and this is not present by default. 2011/4/20 Matthew Hunt <m...@pobox.com>: > On Wed, Apr 20, 2011 at 3:07 PM, Roman Melihhov <ro...@blakout.net> wrote: > >> I got my Tokina 35-70mm f/3.5-4.5 today... I'd noticed one thing. K-5 thinks >> it is >> PENTAX-F 35-70mm f3.5-4.5 lens. > > How are you determining this (i.e. with what software)? I ask because > Pentax does not include a textual name for the lens in the EXIF. That > is, there's nothing in the EXIF that literally says "PENTAX-F 35-70mm > f3.5-4.5". Instead, there's a numerical code that needs to be compared > to a table or catalog that's programmed into the software. > > This means that there are a few possibilities: > > 1) The K-5 really is putting the numerical code for the Pentax lens > into the EXIF. This seems unlikely to me. > > 2) The K-5 is putting the Tokina's correct code into the EXIF, but > your software has an error in its lookup table, and it displays the > "PENTAX-F" description instead. > > 3) The K-5 is putting the Tokina's correct code into the EXIF, but > your software does not actually use that code, or it's missing the > correct entry in its table. So it is making a "best guess" based on > the fact that you're using a Pentax camera, and the focal length and > aperture are consistent with the Pentax lens. (I've seen software that > works this way, because every camera manufacturer encodes the lens > info differently, and they couldn't be bothered to implement Pentax's > method.) > > PhotoME (Windows) does a good job of decoding the EXIF information > accurately, in my experience. > http://www.photome.de/ > > -- > 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/Thibs ---------------------- Photo: K-7, Sigma 28/1.8 macro, FA50/1.4, DA40Ltd, K30/2.8, DA16-45, DA50-135, DA50-200, 360FGZ KX, MX, SuperA+Motor, Z1, P30 Mamiya C330+80/2.8 Sekonic L-208 FalconEyes TE300D x2 Studio flashes Laptop: Macbook 13" Unibody SnowLeo/Win7 Programing: Delphi 2009 -- 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.
