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

Canon RF 100-400mm F5.6-8 IS USM vs Canon RF 100-500mm F4.5-7.1 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 comes out ahead by a narrow margin (4.5 vs 4.8). The gap is mostly about Wildlife, sports and travel photographers who want one premium do-everything telephoto zoom with top-tier sharpness and 500mm of reach in a manageable size. — read the strengths below before deciding.

Ranked #4 in Best Telephoto Lenses for Canon RF

Canon RF 100-400mm F5.6-8 IS USM

4.5

$698.99as of Jun 7

The Canon RF 100-400mm F5.6-8 IS USM punches dramatically above its price, delivering stunning sharpness across the range in a tiny 635g package for around $650. It is the lens that makes long-range telephoto reach accessible and genuinely portable. The compromises are inherent to the budget positioning: a slow variable aperture, a plastic unsealed build, and no included hood.

Strengths

— Stunning sharpness, even wide open, throughout the entire zoom range
— Remarkably light and compact at 635g and only about 16.5cm long
— Excellent value at around $650, a fraction of the pricier RF telephotos

Watch-outs

— Slow variable f/5.6-8 aperture restricts depth-of-field control and low-light use
— Plastic barrel with a plastic mount and no weather sealing
— No lens hood included, an obvious cost-cutting omission

$698.99 · Check Price on Amazon Full review →

Higher ratedRanked #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 →

How they stack up

Canon RF 100-400mm F5.6-8 IS USM

It is the budget entry point of this group, costing roughly a quarter of the Canon RF 100-500mm F4.5-7.1 L IS USM while weighing less than half as much, but it gives up that lens's L-series build, weather sealing and last 100mm of reach. It is slower and less robust than the Canon RF 70-200mm F2.8 L IS USM and Canon RF 200-800mm F6.3-9 IS USM, but far cheaper and lighter than either.

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.

Specs side-by-side

Spec	Canon RF 100-400mm F5.6-8 IS USM	Canon RF 100-500mm F4.5-7.1 L IS USM
Focal Length	100-400mm	100-500mm
Max Aperture	f/5.6-8 (variable)	f/4.5-7.1 (variable)
Mount	Canon RF (full-frame)	Canon RF (full-frame)
Weight	635g	1365g
Filter Thread	67mm	77mm
Stabilization	5.5 stops (lens IS)	Up to 5 stops (lens IS)
Length	164.7mm	—
Autofocus	Nano USM	—
Minimum Focus	—	0.9m (at 100mm)
Teleconverter	—	RF 1.4x / 2x (300-500mm only)

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