On Thu, Apr 29, 2010 at 9:35 PM, Bruce Walker <[email protected]> wrote: > Rob Studdert wrote: >> >> On 30/04/2010, Bruce Walker <[email protected]> wrote: >> >>> I concur. It's already been demonstrated that almost all the modern (ie >>> available to buy) Pentax glass vignettes on FF. I am heavily invested in >>> modern Pentax glass (DA and DA*; ~$4K replacement value) and I am not >>> about >>> to add all new lenses to go along with a FF body upgrade. Not happening. >> >> Where and by whom? Kenny? > > There's a sticky thread at pentaxforums where they maintain the results of > individual tests (including some from Boris Liberman) ... > > http://is.gd/bNPdY > > Boris' collection of test shots (some via Derby Chang) here ... > > http://liberman-family.com/boris/da_lenses_on_film.html > > There are a few question marks, like the DA* 200, but the majority of lenses > have one problem or another (even hood geometry issues) on FF. > > Apparently the DA* 60-250 and possibly the DA* 55 are fine on FF. These > tests were conducted on 35mm film which is larger than present FF sensors, > so some lenses that vignette on film may not do so on an actual FF sensor if > it existed. > > FWIW, Ricehigh has his own table here ... > > http://is.gd/bNQgW > > and arrives at differing, but similarly pessimistic (but what would you > expect?) results. > > -bmw >
Bruce, there's no appreciable size difference between 35mm film and FF sensors. Both are within a tenth or two of a millimeter of the nominal 36x24mm frame size. Certainly there's not enough difference to have differing geometry. In fact FF sensors are more susceptible to edge performance issues due to digital sensors having issues with off-axis light. -- M. Adam Maas http://www.mawz.ca Explorations of the City Around Us. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
