> http://www.dpreview.com/lensreviews/pentax_50_1p4_p15/
At times it sounds like a sales pitch for the Sigma lens the author keeps mentioning. One thing that confuses me was this text about the distance scale: "A distance scale is provided with ... a depth of field scale marked for F11, F16 and F22. As a legacy film lens, this is calibrated for the 35mm full-frame format, and will therefore be somewhat over-optimistic on APS-C DSLRs." How can DOF be affected by a cropped sensor? The lens itself hasn't changed at all, just the image-recording surface area. John -- http://www.neovenator.com http://www.cafepress.com/neovenatorphoto -- 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.
