But the difference in image circle between a full frame lens and an APS lens is much less than that if a medium format lens vs a full frame lens. They do have a sweet spot, although The recent full frame Pentax lenses are generally sharp from corner to corner.
Paul > On May 17, 2020, at 9:02 AM, Ralf R Radermacher <[email protected]> wrote: > > Am 17.05.20 um 14:39 schrieb Henk Terhell: >> I recall some tests by Tony Northrup on YT showing it is better to keep >> FF glass on a FF body and crop in processing than to put a FF lens on a >> crop body, assuming both bodies have sensors from the latest generation. > > This has a lot to do with the old misconception that a medium format > lens gives better results on 35 mm because only the centre of the glass > is used. As a matter of fact, the medium format lens has a lower > resolution because it has to 'illuminate' a much larger area. > > Ralf > > -- > Ralf R. Radermacher - Köln/Cologne, Germany > Blog : http://the-real-fotoralf.blogspot.com > Audio : http://aporee.org/maps/projects/fotoralf > Web : http://www.fotoralf.de > > -- > 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. -- 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.
