Elements and Groups

480sparky

Senior Member
Kinda wondering what the purpose of knowing the number of elements and groups of a lens is needed.

All the manufacturers state this in their lens' specs, but....... why? What purpose does it serve?

Can you tell the difference between a FlareMaster lens 25-75 f/4 compared to a Pincushion King PRO 25-75 f/4, judging the former by having 9 elements in 6 groups and the latter 10 elements in 4 groups?
 
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