![]() But they have to take this into their optical design. The two parts could probably be a kind of parallel plate, if the glas is the same for the two glued together lenses. One would be out of a neutral density filter glas, the other out of clear glas. Sony has made their apodisation element out of two glas elements. This is the reason, why some claim that lenses with many iris blades have a good bokeh.īut these blade number is only interessting with most lenses as soon as one close the iris! How To Make Your Own Bokeh? Most people seem to prefer circle shaped defocus spots - so there is the need for circle shaped iris blades, and many iris blades. For a iris with three blades this looks a bit strange - you could see this at pictures made for example with the Zeiss HFT 35mm f/1.4 or 85mm f/1.4 for Rolleiflex 135 cameras.Ĭarl Zeiss lenses for Contax/Yashica mount with the older AE type have a blade oddity too - the have at some f-stops a jigsaw form. When we close the iris, we see the iris blades. What we see as the "bokeh" borders, are the iris blades, or their surrounding perfect circle shaped housing while the iris is set full open. Here only a short simple explanation how the bokeh is formed. This bokeh is great to be true neutral - the background blur is not stressed. This could be nice for some images, but not for all - most times this would be called a bad bokeh.Ī uniform intensity profile would be called neutral or even good - even if that Bokeh emphasize itself!īut it is not very common to have an intensity profile like a gaussian curve, or something with the borders going to zero. Sometimes the borders of the circles are brighter - as with the Meyer Göerlitz Trioplan 100 f/2.8 used wide open. With normal lenses these are more or less uniform illuminated circels, or ellipsoides (cateyes). Best thing to see it directly are unsharp highlights in the image. This intensity profile could be best viewed in unsharp regions of the image - in the Bokeh. But this Sony lens could be adapted to Canon EOS.Īpodisation is shaping of the intensity profile. ![]() There is even a Canon photographer who mount converted this lens to get that bokeh on Canon. Here in the Xitek forum are many Sony STF example pictures. And some people who like Bokeh quality - not only quantity. People who know the (Minolta) Sony 135mm f/2.8 STF lens know it. Apodization or Apodisation- a very uncommon word!
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