from http://vapour-trail.blogspot.nl/2010_05_01_archive.html
"Existing imitation techniques On Minolta Dynax 7 film cameras, the STF’s smooth bokeh can be mimicked by taking seven exposures on one frame, each exposure with a smaller aperture size. This results in circle of confusions with bright centres and progressively dimmer towards the edge. Alternatively, a long exposure can be made in dim lighting with the camera mounted on a tripod. The aperture ring can then be manually turned to reduce the aperture over the entire duration of the exposure. For this approach, manual lenses with no aperture clicks are most suitable." seven exposures on one frame should be easy with digital. On 4 May 2016 at 09:39, Larry Colen <[email protected]> wrote: > > > Toine wrote: >> >> "STF lenses include an apodization element in their optical formulas >> which creates the STF effect." >> >> Apodization?? That's new for me. This page explains it: >> http://www.4photos.de/camera-diy/Apodization-Filter.html >> >> Replacing the aperture with a gradiant aperture. Another DIY project >> on my bucket list > > > I think I might have actually asked about this on the PDML a while back and > had someone point me to it. It's not quite so much that, as applying a > gradient to one of the lens elements. I suspect that it only affects the > system when it is wide open. > > I wonder if you could also do something with "lacework" on the aperture > leaves so that the edges of the aperture are themselves effectively a > gradient. > >> >> On 4 May 2016 at 05:58, Larry Colen<[email protected]> wrote: >>> >>> Jostein should check this out >>> >>> http://www.pentaxforums.com/articles/photo-articles/smooth-trans-focus-sony-135mm-f28-guide.html?src=eml >>> -- >>> Sent from my Android phone with K-9 Mail. Please excuse any swypos. >>> http://red4est.com/lrc >>> >>> -- >>> 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. >> >> > > -- > Larry Colen [email protected] (postbox on min4est) http://red4est.com/lrc > > > > -- > 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. -- 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.
