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.
