Cheap bought Russian lens review

INDUSTAR 61 L/Z-MC 2.8/50
Made in USSR
Production year 1960's to 2005
Type Tessar, 3 groups 4 elements
Aperture F2.8～16
Mount M42

This lens has been produced from 60's to 2005.
Although it has a martial appearance as if it were a tube,
the lens was developed by combining thick glass with new glass materials
of the time, and has gained a reputation as a lens with excellent image quality.
I think that the star-shaped bokeh created by the unique shape of the
aperture blades is also a major reason for the popularity of this lens today.
It's a lens I've always wanted.
For some reason, I found it on the shelf of a computer store in Tokyo.
The price was about 3 USD, and regardless of its condition,
I bought it as soon as I could.
And as you see, the price includes an adapter for the E-mount.
I can't buy only this for 3 USD, so this lens may be cheaper than free!
Let's start condition check.

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