Posted: Thu Nov 07, 2013 9:56 am Post subject: |
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ZoneV wrote:
Overcorrected spherical abberation gices bubbles in background, and soft bokeh in foreground.
Undercorrected spherical abberation gives soft bokeh in background, and bubble bokeh in foreground.
The Trioplan 100mm f/2.8 seem to have a very strong over corrected spherical abberation. The Diaplan / Pentacon AV 100 the same. The Pentacon AV 80mm/2.8 seem in first tests less strong over corrected spherical abberation.
Spherical abberation in normal helicoid focussed lenses (not IF, no floating elements, not front or backlens focussing) is corrected for one distance, and so front and back bokeh behavior changes with distance.
Knowing this I took a lens with extra macro focussing ring to get the possibility to have a lens with spherical abberation control - like Nikon Defocus Control!
I found the Sigma YS 135mm lens as a good lens for such bokeh control.
In both fore- and background only apodization lenses gives very smooth bokeh. _________________ Camera modification, repair and DIY - some links to look through: http://www.4photos.de/camera-diy/index-en.html
I AM A LENS NERD!
Epis, Elmaron, Emerald, Ernostar, Helioplan and Heidosmat.
Epiotar, Kameraobjektiv, Anastigmat, Epis, Meganast, Magnagon, Quinar, Culmigon, Novotrinast, Novflexar, Colorplan, Sekor, Kinon, Talon, Telemegor, Xenon, Xenar, Ultra, Ultra Star. Tessar, Janar, Visionar, Kiptar, Kipronar and Rotelar.
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