prime lenses

[timlidstone@gmail.com]

can anyone tell me why its given this distinction?? I suspect its much like how we view things. A persons take on stuff may be considered a paradigm. Is the focal length divisable only by prime numbers?

 

[Kim Welch]

I think prime means one and they are a single (one) focal length. Someone probably liked that prime means best and one and it just fit and started calling them primes.

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