However, the 24-70mm has a bigger maximum aperture at f/2.4, while the 24-105mm is only at f/4. When to Use the Canon 24-70mm. You can use the Canon EF 24-70 in various photography niches, including portrait, travel, event, and real estate photography. The wide aperture values allow capturing the best available light for well-lit interiors and
24-105L is very near performance of RF 24-70, corners are tiny bit sharper on wide-end on 24-70, but i prefer 24-105 otherwise, had both to test out, the bokeh wasnt so much diffrient 2.8 vs 4 (also 105mm @ f4 separates more than 70mm @ 2.8) 24-105 is lighter, doesnt make camera front heavy and uses 77mm vs 82mm on 24-70. Make.
The 24-70 is an architecture/landscape and indoor event lens. The 24-105 is a street photography and outdoor event lens. Both are excellent, but both are full-frame lenses that will be annoyingly long on an 80D. For your purposes, take Scott's advice and get the 17-55 f/2.8.
The 24-105mm is a relative bargain at $1,150, since you will pay almost twice as much for the 24 -70mm f/2.8. The price of the 24-105mm becomes even better if you buy it along with a camera, as it is the “kit lens” for some high-end Canon cameras. The Importance of Lens Diameter
The Canon 17-35mm f/2.8 L (1995-2001) is Canon's lightest f/2.8 ultrawide zoom ever, has a metal filter thread and great ergonomics with instant manual-focus override and a great focal length range. Its optics are about as good as the Canon 16-35mm f/2.8 (2001-2007).
In dim light an f/2.8 lens will have a faster and more accurate AF than an f/4 lens would. While you may never shoot it at f/2.8 -- that's what it's going to use to focus. The lens isn't stopped down to your shooting aperture when acquiring or focusing on your subject, it does all that wide-open.
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canon 24 70 f4 vs f2 8