Cameras Ranked

14–35 Canon RF 14-35mm F4 L IS USM vs 15–35 Canon RF 15-35mm F2.8 L IS USM

Canon RF 14-35mm F4 L IS USM vs Canon RF 15-35mm F2.8 L IS USM: no overall pick, it depends on what you need. Pick the Canon RF 14-35mm F4 L IS USM if you carry it all day or travel light, or you want cheaper filters (weight: 540 g vs 840 g; filter thread: 77 mm vs 82 mm). Pick the Canon RF 15-35mm F2.8 L IS USM if you shoot in low light or want a blurrier background (widest aperture: f/4 vs f/2.8). Too close to call (focal length: 14-35 mm vs 15-35 mm).

To one scale. Canon RF 14-35mm F4 L IS USM: length 99.8 mm, diameter 84.1 mm, filter thread 77 mm; Canon RF 15-35mm F2.8 L IS USM: length 126.8 mm, diameter 88.5 mm, filter thread 82 mm.99.8 mmCanon 14–35540 g126.8 mmCanon 15–35840 g
Both to one scale, from each maker's length and diameter, the filter thread in yellow. The rings are drawn, not measured.
To one scale. Canon RF 14-35mm F4 L IS USM: length 99.8 mm, diameter 84.1 mm, filter thread 77 mm; Canon RF 15-35mm F2.8 L IS USM: length 126.8 mm, diameter 88.5 mm, filter thread 82 mm.99.8 mmCanon 14–35540 g126.8 mmCanon 15–35840 g
Both to one scale, from each maker's length and diameter, the filter thread in yellow. The rings are drawn, not measured.

The pick, in points

Lead for a pick: 1

Canon 14–35

2.5points

Wins on weight and filter thread.

Canon 15–35

3points

Wins on widest aperture.

Each real difference scores its importance for the side that wins it; a lead under 1 is “it depends”. How the weights work

The Canon 14–35 on its ownThe Canon 15–35 on its ownAll Canon RF lenses

Where they differ

5 of 19 specs

Each bar is the gap as a share of the smaller value, on one scale from 0 to 100%; an arrow end is a gap past 100%. The dashed tick marks where a gap starts to count.

  1. Widest aperture

    Importance 3

    Canon 14–35f/41Canon 15–35f/2.82

    1.2 apart (42.9%), to the Canon 15–35

    3points

  2. Weight

    Importance 2

    Canon 14–35540 g3Canon 15–35840 g4

    300 g apart (55.6%), to the Canon 14–35

    2points

  3. Filter thread

    Importance 0.5

    Canon 14–3577 mm3Canon 15–3582 mm4

    5 mm apart (6.5%), to the Canon 14–35

    0.5points

  4. Focal length (widest)

    Importance 2

    Canon 14–3514 mm5Canon 15–3515 mm6

    1 mm apart (7.1%), under the 2 mm bar

    0points

  5. Closest focus, wide end

    Importance 1

    Canon 14–350.2 m3Canon 15–350.28 m4

    0.08 m apart (40%), not counted: compared only between lenses of the same focal length (widest)

    0points

Also different, no weight reads them4

  1. Length

    Canon 14–3599.8 mm3Canon 15–35126.8 mm4

    27 mm apart (27.1%)

    Not weighted

  2. Diameter

    Canon 14–3584.1 mm3Canon 15–3588.5 mm4

    4.4 mm apart (5.2%)

    Not weighted

  3. Maximum magnification, wide end

    Canon 14–350.15x3at 14 mmCanon 15–350.21x4

    0.06 apart (40%)

    Not weighted

  4. Stabilization effect

    Canon 14–355.5 stops3Canon 15–355 stops4

    0.5 apart (10%)

    Not weighted

Side by side, to scale

Focal length on one log scale

Focal length on one log scale: Canon RF 14-35mm F4 L IS USM: 14 to 35 mm; Canon RF 15-35mm F2.8 L IS USM: 15 to 35 mm.Canon 14–35Canon 15–35−1 mm1016243550
The focal lengths each maker states.

Specifications

SpecificationsCanon RF 14-35mm F4 L IS USMCanon RF 15-35mm F2.8 L IS USM
Focal length14-35 mm515-35 mm6
Widest aperturef/41f/2.82
Closest focus0.2 m30.28 m4
Maximum magnification0.15x at 14 mm, 0.38x at 35 mm30.21x4
Stabilization5.5 stops35 stops4
Weight540 g3840 g4
Length99.8 mm3126.8 mm4
Diameter84.1 mm388.5 mm4
Filter thread77 mm382 mm4
On sale fromSep 20217Sep 20198
HoodEW-83P3EW-88F4

Same on both

  • Mount Canon RF3
  • Covers Full frame
  • Type Zoom
  • Elements 163
  • Groups 123
  • Aperture blades 93
  • Weather sealed Yes3
  • Focus motor Nano USM3

Full specifications, side by side†

Show all 11 rows
Full specifications, side by sideCanon 14–353Canon 15–354
Diagonal angle of view114°00′ - 63°00′ (Diagonal)110°30′– 63°00′ (Diagonal)
Horizontal angle of view104°00′ - 54°00′ (Horizontal)100°25′– 54°00′ (Horizontal)
Vertical angle of view81°00′ - 38°00′ (Vertical)77°20′– 38°00′ (Vertical)
Closest focusing distance0.2 / 0.660.28 / 0.92
Lens construction12,16 (Groups Elements)12-16 (Groups Elements)
Diameter and length84.1 × 99.8 (Approx.)88.5 × 126.8 (Approx.)
Drive systemNano USMNano USM
Filter size7782
Minimum aperture2222
Diaphragm blades99
Weight540 (Approx.)840 (Approx.)
Rows only one maker lists: 11

Also on the Canon RF 14-35mm F4 L IS USM spec page3

Max magnification at 35mm0.38 (at 35 mm)
Max magnification at 14mm0.15 (at 14 mm)
Dust and moisture resistanceSupported
Lens cap modelE-77 II (Lens Cap)
Lens hood modelEW-83P (Lens Hood)
Lens bag modelLP1219 (Lens Bag)

Also on the Canon RF 15-35mm F2.8 L IS USM spec page4

Max magnification0.21
Anti-dust and moistureSupported
Lens capE-82 II
Lens hoodEW-88F
Lens bagLP1222

How the pick works

  1. Widest aperture3

    Lower wins once they are 0.3 apart.

  2. Weight2

    Lower wins from a 12% gap.

  3. Focal length (longest)2

    Higher wins from a 15% gap.

  4. Focal length (widest)2

    Lower wins once they are 2 mm apart.

  5. Optical stabilization1

    Having it wins.

  6. Closest focus, wide end1

    Lower wins from a 15% gap. Compared only between lenses of the same focal length (widest).

  7. Filter thread0.5

    Lower wins once they are 5 mm apart.

  8. Lead for a pick1

Our pick or our take adds up the importance of each real difference, with these importances and thresholds: a gap smaller than its row's threshold is too close to call and counts as the same. They are our editorial choice, not a measurement, the same on every page, and they never read prices, sales or who sells it.

Paid placements0

How we rank, in full

Sources

  1. Wikidata: Canon RF 14-35mm F4 L IS USM, checked Oct 9, 2026 (CC0 1.0)
  2. Wikidata: Canon RF 15-35mm F2.8 L IS USM, checked Oct 9, 2026 (CC0 1.0)
  3. Canon product specifications: Canon RF 14-35mm F4 L IS USM, checked Oct 6, 2026
  4. Canon product specifications: Canon RF 15-35mm F2.8 L IS USM, checked Oct 6, 2026
  5. www.canon.at: Canon RF 14-35mm F4 L IS USM, cited by Wikidata for Focal length (Wikidata checked Oct 9, 2026; we didn't read this page)
  6. www.canon.at: Canon RF 15-35mm F2.8 L IS USM, cited by Wikidata for Focal length (Wikidata checked Oct 9, 2026; we didn't read this page)
  7. global.canon: Canon RF 14-35mm F4 L IS USM, cited by Wikidata for On sale from (Wikidata checked Oct 9, 2026; we didn't read this page)
  8. global.canon: Canon RF 15-35mm F2.8 L IS USM, cited by Wikidata for On sale from (Wikidata checked Oct 9, 2026; we didn't read this page)

Worked out by code, not stated by a source

  • Read from the lens name: each maker marks the sensor size a lens covers (Sony FE/E, Canon RF/RF-S, Nikon DX, Tamron Di III/Di III-A, Sigma DG/DC); every Fujifilm X lens is APS-C and every Micro Four Thirds lens is Four Thirds.
  • Prime or zoom, read from the focal length in the lens name.

Each value is checked automatically against the source it links, on the date shown. How we build these pages

† The makers' own tables, row by row, with labels in our plain words (translated where the maker's page isn't in English); each row's numbers are checked against the page it links.

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