Electronics

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(NOTE: Not reccomended for Lenses with extension more than 3mm)
Allows lens to be mounted to Micro Four Thirds camera

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Mitakon M42 Mount Lens to Micro 4/3 Camera Turbo Mark II Adapter – Front Adapter Cap – Rear Adapter Cap – Mitakon 1 Year Limited Warranty
Compatibility: M42 Mount Lens to Micro Four Thirds Cameras

Blocks stray light from entering the lens, supply extra protection from accidental impact.
In the backlight, side light or flash photography, to prevent the non-imaging light to enter, to avoid haze
Shades the lens from stray light, improving your contrast and image quality.