Canon RF 24-70mm F2.8L IS USM — Landscape Photographer's Review

Category: Standard zoom, full-frame
Mount: Canon RF
Aperture: Constant f/2.8
Use case focus: Landscape photography

Overview

The RF 24-70mm f/2.8L IS USM is Canon's flagship standard zoom for mirrorless R-series bodies. While it's often marketed as an all-purpose lens for events and portraits, it also holds up well as a landscape tool — covering the wide environmental shot through to moderate telephoto compression without a lens swap. This review is written from a landscape shooter's perspective, covering sun star rendering, wide-angle usability, weight/handling on the trail, image quality, and practical use of ND filters for silky water effects.

⭐ Sun Star Clarity

For landscape work — sunrise/sunset shots with the sun in frame, or sun peeking through trees/rock formations — this is a lens people specifically shop for, and it holds up well:

• Uses a 9-blade aperture, which produces reasonably defined sun stars but not razor-sharp ones.
• Best results appear between f/11 and f/16 — stopping down further (f/22) adds diffraction softness without meaningfully improving the star shape.
• Points are rounded rather than needle-sharp, so if you're chasing the crisp 18-point stars you get from lenses with more aperture blades (or odd-numbered blade counts), this isn't the strongest performer in that specific niche.
• Flare is well controlled thanks to Canon's ASC (Air Sphere Coating) — you get clean stars without much ghosting, even with the sun partially in frame.
• No ND filter needed for the star itself. In practice, this reviewer gets clean, well-defined sun stars straight out of camera without reaching for an ND to tame the sun's intensity first — the coatings do enough of that work on their own. Save the ND filters for water effects (see below); they're not necessary just to shoot toward the sun.

Verdict: Good, not exceptional. Reliable and pleasant for landscape sunbursts at f/11-f/16, and one less filter to carry/swap in the field since it doesn't need an ND to clean up the star.

🌄 Wide-Angle Use (24mm end)

• At 24mm, distortion is minimal and very well corrected in-camera/in-software (RF lenses lean on software correction more than older EF designs) — straight horizons and architectural lines in-frame stay straight.
• Corner sharpness at f/2.8 is good, and stopping to f/8–f/11 (the typical landscape sweet spot) tightens corners up nicely edge to edge.
• Close-focus at the wide end is strong — minimum focus distance around 0.21m at 24mm is great for foreground-interest compositions (rocks, flowers, texture) paired with a big background, a classic landscape technique.
• Vignetting is present wide open but is a non-issue at typical landscape apertures (f/8+), and easily corrected in post if it appears at all.
• 24mm is wide enough for most vista shots but not ultra-wide — if you regularly shoot 16-20mm scenes (tight canyons, big-sky panoramas), you'll still want a dedicated ultra-wide alongside this lens.

Verdict: Excellent for the majority of landscape compositions — vistas, foreground/background layering, architecture. Only limiting factor is that it's not ultra-wide for the rare scene that needs it.

⚖️ Weight & Handling (On the Trail)

• Weighs approximately 900g (31.7 oz) — noticeable on a long hike, especially paired with a tripod, filter kit, and a second lens in the bag.
• Well balanced on full-frame R bodies (R5, R6, R3) — front-heavy on smaller bodies like the RP, which matters if you're hand-holding for long stretches between tripod setups.
• Zoom ring is smooth with good resistance; no zoom creep when the lens is pointed down a slope or hanging on a strap.
• Weather-sealed — a real asset for landscape work in mist, light rain, or sea spray at coastal locations.
• The 82mm front filter thread is on the larger side, which means ND and polarizer filters for this lens run pricier than smaller-thread alternatives — worth factoring in alongside the lens cost if you're building a filter kit for long exposures.

Verdict: A bit of a load for all-day hikes, but weather sealing and build quality are exactly what you want when you're out chasing golden hour in unpredictable conditions. Budget for the larger 82mm filters.

🔍 Image Quality

• Sharpness: Excellent across the zoom range, even wide open at f/2.8. Center sharpness is outstanding; corners are very good and improve further by f/4-5.6.
• Bokeh: Smooth and pleasing for a zoom, especially at 70mm f/2.8, though it can't match a dedicated 85mm or 50mm prime for background separation.
• Chromatic aberration: Very well controlled, minor fringing only in high-contrast edge cases.
• Image Stabilization: Up to 5 stops with IS alone, more with in-body IS on compatible bodies — genuinely useful for handheld video and low-light stills.
• Color rendering: Classic Canon L-series color science — warm, accurate skin tones, punchy without oversaturating.

Verdict: This is where the lens earns its price tag. Genuinely pro-grade image quality throughout the zoom range.

💧 ND Filters for Silky Water

This is where the 82mm front thread and the lens's optical quality both pay off — long-exposure water shots (waterfalls, streams, coastline) are a core landscape technique, and this lens handles it well:

• Filter strength: A 6-stop ND is the practical daytime workhorse for silk-water effects — it gets shutter speeds into the 1-4 second range in normal daylight without needing to stop down so far that diffraction softens the image. Reserve a 10-stop for full midday sun or when you want much longer (30s+) exposures.
• Aperture pairing: Shoot in the f/8-f/11 range with the ND stacked on — this keeps the lens in its sharpest zone rather than pushing to f/16+ to slow the shutter, which is a common beginner mistake that trades sharpness for exposure time you could've gotten from a stronger filter instead.
• No color cast issues: Quality ND filters (Canon's own, or reputable third parties like B+W, Breakthrough, NiSi) show minimal color shift on this lens — no strong magenta or blue cast to correct in post, which isn't always true on wider or more exotic lens designs.
• Vignetting with filters: At 24mm with a thicker ND filter or a filter + polarizer stack, watch for mechanical vignetting in the corners. A slim-profile ND is worth the extra cost if you shoot wide with filters stacked.
• Focus behavior: Autofocus works fine before the ND goes on; with a strong ND (10-stop+) attached, switch to manual focus and focus first, since AF can hunt once the filter cuts that much light.
• Polarizer + ND combo: The 82mm thread makes stacking a circular polarizer + ND straightforward for waterfall/stream shots where you also want to cut glare off wet rocks — just budget for the vignetting check above.

Practical workflow for silk water: Compose and focus (or lock focus) before attaching a strong ND → attach filter → meter and adjust shutter speed → shoot at f/8-f/11 → check corners for vignetting at 24mm.

Verdict: The 82mm thread and clean optical performance make this a strong lens for ND filter work — budget for slim-profile filters if you shoot wide.

Summary Table (Landscape Use)

Final Take

Ha ha covered my take in the beginning, 2nd paragraph!