TheToadMen
Subscriber
In portraiture getting the human facial features the right size scale and proportion to each other is very important and using either a too short or too long focal length lens will distort that relationship and make the nose too big with a wide angle or standard lens used too close, or the face too flat with a too long telephoto one, generally in 35mm photography the ideal portrait focal length is around 85/90/100 and in medium format around 150/180.
I find with the Mamiya C lenses for portraiture I prefer using the 135mm lenses indoors where space is restricted and the 180mm outdoors.
http://mcpactions.com/2010/07/21/the-ideal-focal-length-for-portraiture-a-photographers-experiment/
I get it. Thanks for the clarification! (English is not my native language so I wasn't sure at first).