Color Rikenon 35mm 2.8 fun lens with triangle aperture.

Started Jul 17, 2017 | Discussions thread
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E Dinkla Senior Member • Posts: 2,681
Color Rikenon 35mm 2.8 fun lens with triangle aperture.
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Last adaption/conversion. Cannibalised a Ricoh FF1. http://camerapedia.wikia.com/wiki/Ricoh_FF-1

Rikenon 35mm 2.8 lens to A7RII FE mount, Tessar type lens with front cell focusing. . This time I used a LTM thread to FE adapter with a 39mm ring attached with small inbus bolts so the aperture/focus numbers can be rotated to the top. I used the thread with some 3D printed rings + cone ring behind the lens to get infinity correct. The lens has a wide aperture ring and a small focusing ring, not so handy in practice. Main attraction is the triangular aperture. One image taken at 4.0 shows the triangular "bokeh" in the ivy foliage. I doubt I will use it much. Looks silly on a A7RII too. Anyway my FreeCad skills improved for the next jobs to do.

Few SLR lenses with triangle stops but the Rollei Planar 85mm 1.4 is one of them. Bokeh shape shows better with that lens due to the longer focal length and wider opening, at 2.0 the triangle is already formed I guess.

Met vriendelijke groet, Ernst
750+ inkjet paper white spectral plots: OBA content etc.
http://www.pigment-print.com/spectralplots/spectrumviz_1.htm

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