This is a 500mm F/8 russian mirror lens (m42 mount) of Maksutov (not Matsukov, as I first spelled it) design, manufactured by LZOS.



Significantly more compact than a traditional 500mm lens, it is reasonably hand-holdable if there is enough light. While it is f/8, its actual transmission factor is about T/10, as the central mirror obstructs some of the light.

With such a focal length, you can shoot objects which are significantly far away...



... or isolate "details":






While it is advertised to be a macro lens, in reality it allows close-ups, but not more:



(this is an high-key shot, so if your screen is not properly calibrated, you might not see anything on this picture)

With this long focal length, you can shoot architecture with nearly no perspective distortion:



As it has no diaphragm, this might get a bit tricky if you are directly shooting against light. This picture is shot at 1/4000s, and it was quite close to have clipping on highlights:



This is likely why it is provided with a neutral density front filter.

The central obstruction makes the bokeh to look like doughnuts (torus):



With a bit of practice, you can actually use this feature to enhance your shots:

Surely, you mean Maksutov ;-)

I love the donut bokeh circles; those could be effective in, admittedly, very restricted circumstances, but the last pic is one of them :-)

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