I already have the Зенитар (Zenitar) 16/2.8 fisheye lens. And this copy is quite good [optically]. But I like the Risespray 11/2.8 (for Sony FE/E) better.
It has better resolution and is generally nicer. Although it also has mechanical weaknesses. My copy had to be repaired right after I bought it. But now it is ready for use (with some play in the focusing mechanism).
Unlike the mirrorless TTArtisans 11/2.8, the Risespray has 10 aperture blades and good sunstars.
The Risespray has a good image quality at f/2.8.
At close objects, the background blur starts to be visible (still here is a very short focal length).
The closer you get, the stronger the blur.
When the subjects are quite small, you can see the specific design of the diaphragm. At f/2.8, the polygons (decagons) in the blur appear as if the aperture were closed.
(crop 1:1)
But this is hardly a drawback.
By the way, this lens has a short minimum focusing distance: 170mm from the sensor plane. The front optical element is very close to the subject (about 65mm).
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