Quote Originally Posted by JJC
After two decades of stagnation, three years ago my interest in photography was revived by the purchase and use of a TLR. My favorite film has become
Kodak Portra 160 VC, but my nagging curiosity is ... Why didn't Kodak (and others) make this a nice round number like 200 so it would fit in a normal film speed lineup of 100, 200, 400, etc.? Is there some special circumstance in which the 160 speed offers an advantage?
I'm not complaining, just wondering.

160 ISO/ASA does seem to be an odd rating for a films sensitivity but I like these films very much. Kodak Portra 160NC/VC & Fuji NPS 160 are colour negative films that are designed for optimum rendering of skin tones in portraiture and are very popular with Wedding and Portrait photographers.
It is a pity that there isn`t a T-MAX or NEOPAN 160 B&W portrait film to compliment the colour emulsions.