Head-to-head · Best Telephoto Lenses for Canon RF

Canon RF 100-500mm F4.5-7.1 L IS USM vs Canon RF 70-200mm F2.8 L IS USM

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

Canon RF 100-500mm F4.5-7.1 L IS USM and Canon RF 70-200mm F2.8 L IS USM score essentially the same (4.8 vs 4.8). Pick the one whose trade-offs match your priorities — the strengths and watch-outs below are where they actually differ.

Ranked #1 in Best Telephoto Lenses for Canon RF

Canon RF 100-500mm F4.5-7.1 L IS USM

4.8

$2,799as of Jun 7

The Canon RF 100-500mm F4.5-7.1 L IS USM is the most versatile super-telephoto zoom in the RF lineup and the benchmark for the mount. It delivers L-series sharpness corner to corner across a huge 5x range, focuses fast and accurately, and stays surprisingly light at 1365g. The slow variable aperture is the only real compromise, making it a daylight specialist rather than a low-light tool.

Strengths

— Extremely sharp from corner to corner across the entire 100-500mm range, even wide open
— A 5x zoom that reaches 500mm yet weighs only 1365g, lighter than the EF 100-400mm it succeeds
— Fast, accurate autofocus that locks on even in very dim light

Watch-outs

— The variable aperture darkens quickly, reaching f/6.3 by 363mm and f/7.1 at 500mm
— Works best with ample light; not a low-light or deep-shade performer
— Teleconverters only attach beyond about 300mm, limiting their usefulness

$2,799 · Check Price on Amazon Full review →

Ranked #2 in Best Telephoto Lenses for Canon RF

Canon RF 70-200mm F2.8 L IS USM

4.8

$2,699as of Jun 7

The Canon RF 70-200mm F2.8 L IS USM reinvents the classic pro zoom for mirrorless, delivering the performance of a full-size 70-200mm f/2.8 in a package nearly 30% lighter and shorter. It is sharp wide open across the range, has class-leading stabilization, and pairs a constant f/2.8 with gorgeous bokeh. The trade-offs for that compactness are an extending barrel and no teleconverter support.

Strengths

— Beautifully sharp across the entire range, even wide open at f/2.8
— Nearly 30% lighter and shorter than the EF Mark III at around 1070g
— Exceptional image stabilization rated up to 7.5 stops with in-body IS

Watch-outs

— Externally zooming design extends the barrel and is less weather-resistant in concept
— Cannot accept teleconverters, so it is locked to its 70-200mm range
— Longer minimum focus distance than some rivals

$2,699 · Check Price on Amazon Full review →

How they stack up

Canon RF 100-500mm F4.5-7.1 L IS USM

It is the all-rounder of this group, sharper and brighter than the budget Canon RF 100-400mm F5.6-8 IS USM and far more flexible than the fixed Canon RF 800mm F11 IS STM. It cannot match the constant f/2.8 of the Canon RF 70-200mm F2.8 L IS USM for low light, nor the raw 800mm reach of the Canon RF 200-800mm F6.3-9 IS USM, but it covers the widest practical range with the best optics here.

Canon RF 70-200mm F2.8 L IS USM

It is the low-light and portrait specialist of this group, the only lens here with a constant f/2.8 aperture, far brighter than the variable-aperture Canon RF 100-500mm F4.5-7.1 L IS USM, Canon RF 200-800mm F6.3-9 IS USM or Canon RF 100-400mm F5.6-8 IS USM. The trade-off is reach: it stops at 200mm and cannot take teleconverters, so it lacks the wildlife range of the others.

Specs side-by-side

Spec	Canon RF 100-500mm F4.5-7.1 L IS USM	Canon RF 70-200mm F2.8 L IS USM
Focal Length	100-500mm	70-200mm
Max Aperture	f/4.5-7.1 (variable)	f/2.8 (constant)
Mount	Canon RF (full-frame)	Canon RF (full-frame)
Weight	1365g	1070g
Filter Thread	77mm	77mm
Stabilization	Up to 5 stops (lens IS)	Up to 7.5 stops (with in-body IS)
Minimum Focus	0.9m (at 100mm)	0.7m
Teleconverter	RF 1.4x / 2x (300-500mm only)	Not compatible

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