Originally Posted by Steve Smith
Sunny 16 states that you use the closest shutter speed to 1/ISO. For ISO 100 this is 1/125.
It seems odd that Weston would have two standards for their own sensitivity scale.
But isn't 1/100 is closer and most cameras made in recent years have that shutter speed. Also your figure for 4095 cd/m^2 is for a meter calibrated with K=12.5 which is fine.