Nikon 50/3,5 auto micro pre AI

This lens is cheap among macro lenses, but the quality of it isn't cheap.

cropped one

Infinity test

crop from above

Miranda MC 24/2,8 PK A mount

in Lenses world, Miranda is known as brand with their own mount. However this lens is said not produced by the real Miranda. Some say this is Cosina made lens. it's character, build. indicate that.

My first impression; 

It can focus close for macro.  around 10cm, but It's not real macro lens.
At infinity, F8 is best performance.
very low distortion

wide open

Against strong light

 

Close focus, wide open

Mamiya Sekor Auto 55/1,4 SX

This is not my lens, we swap lens.

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wide open

comparison mamiya sekor 55/1,4 sx with Olympus zuiko 50/1,4 at wideopen