Various cheap alternatives to Trioplan; lenses producing soap bubble bokeh on Nikon D800 and Sony A7: Adapted Lens Talk Forum: Digital Photography Review
Talk about crazy, Soap Bubble Bokeh! | Mu-43
Soap bubble bokeh | JohnGravett | Blipfoto
TTArtisan100mm F2.8 Soap Bubble Bokeh F28 Lens with M42 Screw Mount and Lens Adapter for Leica Canon Nikon Fujifilm Sony Pentax - AliExpress
Re: Is this "soap-bubble bokeh"?: Adapted Lens Talk Forum: Digital Photography Review
Soap Bubble Bokeh And Swirly Bokeh
Bokeh of many different vintage primes. Bokeh balls and soap bubbles from "the fence bokeh test". - YouTube
100mm F2.8 Bubble Bokeh – TTArtisan
TTArtisan 100mm F2.8 Bubble Bokeh-Full Frame Lenses-TTArtisan Official Website
nikon - Help me find a lens with peculiar bokeh - Photography Stack Exchange