Archived posting to the Leica Users Group, 2009/03/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Tim's shot is a perfect example of how the 50 Summilux ASPH. renders those out of focus point light sources. Note that the 'discs' are even, clear edged and have no halo or outer ring effect. Where the lens is stopped down the individual aperture blade shapes are defined there too. A very well corrected lens. Here's a couple of examples of excellent performance reproducing the shadowed areas. Note the clarity and colour saturation. http://www.pbase.com/hoppyman/image/93634580 http://www.pbase.com/hoppyman/image/91239055 2009/3/25 Tim Gray <tgray at 125px.com> > Yup it happens with all lenses. Some might be more prone to it due to > design; I don't know. That's probably the case. Anyway, here's a > shot of the 50 ASPH wide open with christmas lights in the background. > You can see the same thing going on, though (subjectively) not as > bad. > > <http://www.flickr.com/photos/tgray1/3092117057/> > > On Tue, Mar 24, 2009 at 11:12 PM, bob palmieri <rpalmier at depaul.edu> > wrote: > > > > On Mar 24, 2009, Tim Gray wrote: > > > >> Are you referring to the non circular shape of the out of focus > >> highlights? If so, that will happen on most large aperture lenses > >> wide open. It has to do with the angle of the light is coming in. > >> Take your lens, look at it off axis (like 25-30 degrees off) and note > >> that you can't see the full aperture because of the angle. That will > >> probably happen with almost any fast 50 you shoot with. > > > > Yeah... the overall shape thing made me think about the image of the > > physical aperture from an off-axis point of view. > > > > Thing is... I'm wondering why I haven't seen it in any snaps I've shot > with > > other fast lenses; I'm gonna hafta try to smoke it out of some of the > other > > glass in the closet. > > > >> > >> If you are talking about the bright ring on the outer part of the out > >> of focus highlights, that has to do with lens design and another fast > >> 50 might work better for you. The Zeiss 50/1.5 might satisfy you. I > >> think it has to do with correcting spherical aberration, which the > >> Zeiss has a lot of, so it has smoother out of focus highlights (behind > >> the plane of focus). It also has focus shift :) > > > > Yeah... that excessive focus shift business can be a dealbreaker. > > > >> > >> I assume you were joking about bokeh being the cause of the lack of > >> view on the Guy picture :) > > > > Yeah... > > > > Bob Palmieri > > > > _______________________________________________ > > Leica Users Group. > > See http://leica-users.org/mailman/listinfo/lug for more information > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information -- Cheers Geoff 'Life's too short for mediocre glass' http://gallery.leica-users.org/v/gh/a/ http://www.pbase.com/hoppyman