These are playlists, each with three videos.
The video shows how different modifications of our lenses affect the image.

Bokeh, Purple, Amber.

 

37 mm / F2.8 – Mir 1B - Examples of the effect of the modifications on the image

58 mm / F2 – Helios 44-2 - Examples of the effect of the modifications on the image

85 mm / F2 – Jupiter 9 - Examples of the effect of the modifications on the image

135 mm / F3.5 – Jupiter 37A - Examples of the effect of the modifications on the image