Very small, and very light. Same reason to pick this over the 2.8 in the EF series. If you shoot mainly outdoors, and don't do a lot of portraits, its worth the price and weight savings, IMO. If you shoot indoor sports or want to use this as a protrait lens, then you need the 2.8.im about to buy the r6 and one of the two 70-200. f2.8 or f4? what would speak for a f4?
-Brian
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