Speaking really generally, the 70-200mm f/2.8 is a widely used workhorse. I'd wager that nearly every photojournalist has one. It great for nearly any event, lecture, wedding, reception, portraiture, even some sports. The 85mm f/1.2 strikes me as an ideal lens for portraiture, but fairly limited for other things.
I use EF 70-200/2.8L IS II with my R5, and I would not move to RF f/4 or even 2.8, because I can accept the huge weight the EF lens, and also it's so good that I don't care for RF anyway. I shoot quite often at 200/2.8 for compression and background separation, so no f/4 for me (althrough it's not as big difference, but I already minmax it so
Earlier this summer, when I switched over almost all of my lenses from the EF mount to the RF mount, after buying the Canon EOS R5, I made an assumption that
RF 70-200 F4 EF 70-200 F4 EF 70-200 F2.8 Version II used EF 70-200 F2.8 Version III used (if I find a good deal) Would be using this lens primarily for sports, but also a good take-a-long for hiking. My encounters with low light have been limiting w the EFS 55-250 f4-5.6, which is why I listed the 2.8 versions.
小編自己平常工作還在用中望遠變焦鏡就是 EF 版的小小白 IS 一代，因此更能體會 f/4 恆定光圈所帶來的便利度，雖然沒有 f/2.8 的背景虛化能力，但輕巧畫質又穩定，長時間追焦體力負擔也不會過大，所以 RF-Mount 的 RF 70-200mm f4L IS USM 自然也是備受期待！ Unlike the f/2.8 lens, the 70-200mm f/4L has its control ring at the end of the lens, and it turns with satisfying clicks. The two RF 70-200mm lenses: RF 70-200mm f/4L IS (left), RF 70-200mm f/2.8L IS (right) Like the faster f/2.8 variant, the RF 70-200mm f/4L IS features an extending zoom design, which keeps the lens incredibly compact. 2pVDSbD.
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    • canon rf 70 200 f4 vs f2 8