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Canon 50mm F1.4 FD SSC Review

Started May 4, 2020 | User reviews thread
WindwardHaole Senior Member • Posts: 1,550
Re: Onion Rings

The subject is "onion ring" bokeh, which is caused by the use of aspherical elements and the way those elements are manufactured. "Donut" bokeh which is normally produced by mirror telephotos results from the ring shape of the primary or main mirror in the optical design.

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