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

Canon RF 100-400mm F5.6-8 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 70-200mm F2.8 L IS USM comes out ahead by a narrow margin (4.5 vs 4.8). The gap is mostly about Portrait, wedding, event and sports shooters who need a fast constant-aperture telephoto for low light and subject separation in a lighter-than-ever body. — 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 #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 100-400mm 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 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 100-400mm F5.6-8 IS USM	Canon RF 70-200mm F2.8 L IS USM
Focal Length	100-400mm	70-200mm
Max Aperture	f/5.6-8 (variable)	f/2.8 (constant)
Mount	Canon RF (full-frame)	Canon RF (full-frame)
Weight	635g	1070g
Filter Thread	67mm	77mm
Stabilization	5.5 stops (lens IS)	Up to 7.5 stops (with in-body IS)
Length	164.7mm	—
Autofocus	Nano USM	—
Minimum Focus	—	0.7m
Teleconverter	—	Not compatible

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