Shutter speed selection for Riga Minox

I usually do not carry an exposure meter when using Riga Minox

I use sunny 11 rule. ASA 50 film, shutter 1/500 sec

> 50*(11/(3.5))^2;

493.8775510

Hence sunny 11 rule with Riga Minox becomes

Riga Minox: SUNNY 500 RULE OF THUMB

Minox B,C, LX, TLX, CLX, EC etc all has exposure meter.

I never use Minox AX gold to take picture, theoretically, sunny 500 rule also apply