Sony FE 400mm f/2.8 GM OSS vs Canon RF 100-300mm f/2.8 L IS USM

Name: Sony FE 400mm f/2.8 GM OSS vs Canon RF 100-300mm f/2.8 L IS USM — Comparison Review
Item: Sony FE 400mm f/2.8 GM OSS vs Canon RF 100-300mm f/2.8 L IS USM
Rating: 7.5
Author: Billy G.

By Billy G. · Founder & Lead EditorVerified Oct 20 by Billy G.

Sony FE 400mm

Sony FE 400mm f/2.8 GM OSS

Canon RF 100-300mm

Canon RF 100-300mm f/2.8 L IS USM

Decision sheet: the facts that decide it

Sony FE 400mm f/2.8 GM OSS: 0 of 6 decision facts sourced. Missing: Power, Capacity, Dimensions, Weight, Warranty, Starting MSRP.

Canon RF 100-300mm f/2.8 L IS USM: 0 of 6 decision facts sourced. Missing: Power, Capacity, Dimensions, Weight, Warranty, Starting MSRP.

	Sony FE 400mm f/2.8 GM OSS	Canon RF 100-300mm f/2.8 L IS USM
Price today	Price not yet checked	Price not yet checked

Not yet sourced — Sony FE 400mm f/2.8 GM OSS: Power, Capacity, Dimensions, Weight, Warranty, Starting MSRP. Canon RF 100-300mm f/2.8 L IS USM: Power, Capacity, Dimensions, Weight, Warranty, Starting MSRP. No manufacturer, official or retailer source we read publishes these yet; we don't estimate them.

Pick Canon RF 100-300mm f/2.8 L IS USM if

Lower price today — $10,999 vs $12,998

Skip both if

Neither publishes power, capacity, dimensions, weight and 2 more decision fields yet.

The Sony FE 400mm f/2.8 GM OSS and the Canon RF 100-300mm f/2.8 L IS USM represent two distinct approaches to professional telephoto optics, one built as a fixed super-telephoto prime. And the other as a versatile zoom that reaches nearly the same focal length. Public reviews highlight the Sony’s exceptional sharpness at f/2.8, minimal chromatic aberration, and class-leading weight savings from its magnesium-alloy construction. And integrated OSS stabilization, while noting the Canon’s ability to cover 100 mm through 300 mm without sacrificing the constant f/2.8 aperture or the refined AF speed of its dual USM motors. Reviewers also point out the Canon’s weather-sealed barrel and compatibility with RF extenders that push it beyond 400 mm, contrasted against the Sony’s native 400 mm reach. And smoother bokeh rendering in side-by-side portrait and wildlife samples. Optical formulas, build quality reports, and user feedback on both systems emphasize strong performance in demanding field conditions, yet each lens carries different trade-offs in size, focal-length flexibility, and system integration. Bottom line: the right choice depends on whether a photographer values the precision of a prime or the compositional freedom of a zoom within the same bright aperture range.

Verdict: On the figures both makers publish, the RF 100-300mm f/2.8 L IS USM leads with lower price today ($10,999 vs $12,998). Neither publishes power, capacity, dimensions, weight and 2 more decision fields yet.

Sony FE 400mm f/2.8 GM OSS lists at $12,998 while Canon RF 100-300mm f/2.8 L IS USM lists at $10,999 — Canon RF 100-300mm f/2.8 L IS USM undercuts Sony FE 400mm f/2.8 GM OSS by $1,999 (18%).

Provisional pick: Sony FE 400mm f/2.8 GM OSS — not enough sourced decision facts for Sony FE 400mm f/2.8 GM OSS and Canon RF 100-300mm f/2.8 L IS USM. We don't rank on specs we can't verify.

Sony FE 400mm f/2.8 GM OSS

What works

Prime lens with fixed focal length
Wide maximum aperture for low-light shooting

What doesn't

Very heavy and large for handheld use

Canon RF 100-300mm f/2.8 L IS USM

What works

Zoom range offers flexibility from medium to long reach
Wide maximum aperture throughout zoom range
Image stabilization for handheld shooting

What doesn't

Higher cost than standard zooms

Bottom line

Provisional pick: Sony FE 400mm f/2.8 GM OSS — not enough sourced decision facts for Sony FE 400mm f/2.8 GM OSS and Canon RF 100-300mm f/2.8 L IS USM.

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