Weight savings from last EF lens to curent RF lens is 22-30%.You can't have everything...like lighter weight and a faster lens...well not until you successfully break the laws of physics. Same probably goes for the other options: longer and lighter or longer and faster. Or maybe you can have them if your name is on this list: https://www.bloomberg.com/billionaires/. Fortunately for me, I've got the lenses I want and I can rent the others........
Prior EF lens main draw is lighter and faster.
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