hi everyone i just have a simple qn
it's about lenses. they all have names i wanna understand.
like : Canon EF 50mm f1.8 or Pentax 50mm f1.4 MF
i understand that 50mm is the focal distance and f1.8 is the apature value
but 50 focal length is how long? 50mm?(i just find no sense as so many lens are like 50mm or 35mm or somewhat similar naming so everyone of them can only take objects close or wat?)
what is the exact meaning of their names?