The Fujinon SF lenses are triplets -- without the discs -- and you can control the effect by stopping down. And with the discs, you can adjust the SF effect. If I am correct, the Imagons are two element optics, and work similarly -- with and without discs. But a good achromatic or apochromatic close-up lens -- adapter to a shutter -- can accomplish much the same:
http://fuzzcraft.com/achromats.html
The black edges can be accomplished in many ways, either on camera or on enlarger.
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