This is one of the Mitakon [Zhongyi] Creator lenses. The Mitakon [Zhongyi] Creator 1:2/35mm.
The lens has 7 elements in 5 groups and 9 aperture blades.
The lens does not offer outstanding image quality, but its characteristic is a rather smooth background blur (especially for a retrofocus lens).
The Mitakon 35/2 has several mount options. My copy has a Pentax K mount. I chose this mount to be able to use it with a film camera (I have several suitable ones). But when I tried to mount the lens on
my Vivitar V3800, I broke the camera.
The stop-down coupler broke off after I tried to mount the lens.
The stop-down indicator is made of plastic and fell off because of the Mitakon lens.
The reason is the incompetence of Zhongyi Optics. They do not have enough knowledge and understanding to design a Pentax K mount lens.
In contrast to all Pentax K digital cameras, almost all Pentax K film cameras have the stop-down coupler (except cameras with "crippled" Pentax K mount). The stop-down coupler is used to mechanically transmit of the position of the aperture ring to the camera for proper metering with automatic diaphragm.
For example, one of the Pentax lenses has a stop-down indicator:
Even if a lens does not have an automatic aperture (as in the case of the Mitakon lens) there should be a groove for the stop-down indicator.
For example, a T[2]-mount to Pentax K adapter:
Now look at the flange of the Mitakon lens:
There is no a groove, so mounting the lens on a Pentax K film camera can break or bend the stop-down coupler.
Unfortunately, my Vivitar V3800 cannot measure the exposure correctly after such a break. Even with an M42-Pentax K adapter the camera now assumes that the aperture is fully closed, so the metering is incorrect. I should use a dedicated light meter.
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