by Miles Hanley
(Columbia, SC)
"I just purchased the Canon 90d and bought the ef-s 17-55mm f/2.8. I am looking at purchasing the Canon 70-200 f/2.8 is iii and I just read your article on the 70-200mm f/2.8 vs. the f/4.0. You made some compelling arguments for getting the less expensive f/4.0. And this would make sense on a full frame camera. But with crop sensor cameras the crop not affects the focal length but also the minimum and maximum (if not constant) aperture. So the f/2.8 is effectively an f/4/5 and the f/4.0 is effectively f/6.4. Would this make it more sense to purchase the faster lens with a crop sensor camera?"
Hi Miles,
Congrats on choosing the 90D. I am really enjoying mine too, for several reasons! The topic of the comparison of the Canon 70-200 f/4 vs. f/2.8 is a fascinating topic for Canon nerds like me (and perhaps you). My biggest points for choosing the f/4.0 vs. the f/2.8 are price and size. But, I've got to tell you. You can't go wrong with choosing the 70-200mm III.
Bruce Lovelace is the publisher of Canon Camera Geek. Read more about him on the About Page. He also publishes how to articles and camera gear reviews at the Photography Tips website.
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