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AhamB
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Re: Rokinon 85mm vs Zeiss Quick Test


sebboh wrote:
aren't molded aspherical elements plastic?


No. Molded aspherics are pressed in a mold and they are the ones showing the onion rings in the bokeh, due to the spiral groove pattern in the mold. There are aspherics that are grinded, which is more difficult/expensive to repeat than reusing a mold.
Then there are composite aspherics that consist of a spherical element with a plastic layer that makes it aspherical.



May 03, 2011 at 06:28 PM



  Previous versions of AhamB's message #9553733 « Rokinon 85mm vs Zeiss Quick Test »