On 24/1/17, Ralf R Radermacher, discombobulated, unleashed: >The Tessar is a four-element lens with a maximum aperture of 2.8, the >Planar has six or seven elements and opens up to 1.4. > >The Tessar had its hayday when a lack of efficient lens coatings acted >in favour of designs with less glass/air surfaces. > >The Planar has a far better sharpness distribution. > >https://en.wikipedia.org/wiki/Tessar >https://en.wikipedia.org/wiki/Zeiss_Planar
Thanks Ralf -- Cheers, Cotty ___/\__ Broadcast, Corporate, || (O) | Web Video Production ---------- <www.seeingeye.tv> _____________________________ -- 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.
