How to make a hood for Biogon G 21mm

[Orio]

Contax did not provide with one.
So, take a protection filter diameter 55 and remove the glass, and mount it.

http://www.c-creators.co.jp/take/contax/21hood-e.html

If not enough, you can add to it a step-up ring from 55 to 58.
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