On Apr 17, 2015, at 11:59 AM, Mark Roberts <[email protected]> wrote:
> Stanley Halpin wrote: > >> You will get more diffraction at f/22 on a wide angle lens than you will at >> f/22 on a mid-range lens than you will get at f/22 on a longer focal length. > > That's not true. Although the physical diameter of the aperture at any > given f-stop is greater on longer focal lengths, the increase in > magnification is *exactly* proportional, thus magnifying the > diffraction effects of f/22 on a 300mm lens so they're exactly equal > to the diffraction effects on a 24mm lens, for example. > > Ansel Adams and his f64 group actually made photos that lost quite a > bit of sharpness due to diffraction. They made up for it by using > large format view cameras that required little or no enlargement for > printing. When I've looked genuine Ansel Adams prints close up aI've > often been surprised at how sharp they aren't. > > > -- > Mark Roberts - Photography & Multimedia > www.robertstech.com > I may well be mis-remembering what I read and so I will concede that you may be right about diffraction Mark. At least until I go back and do some more reading on the subject... stan -- 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.
