----- Original Message ----- From: "Bob Sullivan" Subject: K20D & back focus
> Reading the promo literature on the K20D, I noticed a new feature. > The camera has the ability to store adjustments for backfocus (or > forward) for 20 lenses. > The claim is that all the DA lenses are fine, but others may need adjusting. > > Any ideas on why this might be? > Do some lenses transmit more of the right wavelength light for focusing? > I am puzzled as to the physics/mechanics of this. I'm still trying to decide which lenses I won't be calibrating because there are only 20 presets. William Robb -- 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.
