What are the alternatives to the ttartisan m 100mm f 2 8 bubble bokeh?

Here is what the site says about that.

From TTArtisan M 100mm f/2.8 Bubble Bokeh: TTArtisan M 100mm f/2.8 Bubble Bokeh: A prime lens by TTArtisan for Full frame cameras, 100mm f/2.8. Designed for soap-bubble bokeh highlights. Specs - Maker: TTArtisan - Focal length: 100mm (prime) - Maximum aperture: f/2.8 - Made for: Full frame sensors - Mounts: Leica M - Stabilised: no - Autofocus: no, manual focus What it frames like - On full frame (Leica M): as marked, 100mm. Cameras it fits - Leica M9: Full frame - [Leica ...

From Focal length converter: Focal length converter: A focal length is a property of the lens, but how much of the scene it shows depends on the sensor behind it. A 50mm lens frames like a 75mm on full frame when it sits in front of an APS-C sensor, and like a 100mm in front of Micro Four Thirds. To compare lenses across systems, convert them to the same format; full frame is the usual reference.

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