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Old 02-04-2019   #2
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michaelwj is offline
Join Date: Feb 2013
Location: Brisbane AUS
Posts: 2,106
It simply means that one surface of one element doesn’t have a single radius of curvature. As in, it’s not spherical.
As far as better? It usually means the lens designer can replace multiple elements with one element and therefore make a lens simpler and or smaller.
As for your poll, it’s is so misinformed that none of the choices make any sense. Is there a “none of the above”?
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