Archived posting to the Leica Users Group, 2013/08/10
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]it's a quite pleasant look ric On Aug 10, 2013, at 10:32 AM, lrzeitlin at aol.com wrote: > Back in the Dark Ages when I studied astronomy, astronomers still used > single element lenses in refractor telescopes for many types of solar > observations. Before the widespread use of lens coating, single element > lenses, or at worst a dual element cemented achromat, had less flare than > the much more highly corrected multielement anastigmat lenses. With long > focal lengths, a narrow angle of view, and a maximum aperture of f11 these > lenses were sharp and relatively flare free. Indeed, most of the early > long focus Leica and Zeiss "telephoto" lenses used for sports and wildlife > photography had simple cemented achromat doublets at the end of a long > tube. It is possible to get very sharp photos with a simple lens but you > have to work at it. It is so much easier today. > Larry Z > - - - - > Alan Magayne-Roshak writes: > > > Two taken with an old single-element (approx. f/2.8) magnifying lens > mounted in an extension tube. > > > Artificial lily in my office: > <http://gallery.leica-users.org/v/Alan+Magayne-Roshak/Trees/20130726_MR_Mine_30D2037.jpg.html> > Coneflower in front yard: > <http://gallery.leica-users.org/v/Alan+Magayne-Roshak/Trees/20130730_MR_Mine_30D2047.jpg.html> > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information