Or http://www.reynardcorp.com/products/optical-components/variable-filters/bullseye-radial-apodizing-filters/160-bullseye-apodizing-nd-filters-clear-center.html
On 4 May 2016 at 13:37, Toine <[email protected]> wrote: > 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.
