カメラ 比較

How to choose a camera in 2026

The Mars Score for interchangeable-lens cameras weights sensor + image quality (35%), autofocus + speed (25%), video (20%) and handling (20%). The mirrorless transition is complete: every major mount now ships flagship bodies, and the question is which system you can grow into for the next decade.

Sensor size: full-frame, APS-C, Micro Four Thirds

Full-frame (Sony A1 II, Canon R5 Mark II, Nikon Z8, Panasonic S5 IIX) gives the cleanest low-light performance and the shallowest depth of field. APS-C (Fujifilm X-T5, X-H2S, Sony A6700) is one stop noisier but a third of the weight and price. Micro Four Thirds (OM System OM-1 Mark II) is the smallest pro system and uniquely strong for telephoto wildlife and macro. Pick sensor size by what you carry, not by spec sheet.

Autofocus: subject detection has changed everything

2024–26 autofocus systems detect human eyes, animal eyes, bird heads, vehicle types, and aircraft — and stay locked through obstacles. The flagship gap (A1 II, Z9, R3) over mid-tier (A6700, Z6 III, R7) is closing, but burst rate (burst_fps) and buffer depth still favor pro bodies. Our Mars Labs hands-ons measure real-world keeper rates.

Video: 8K is mostly marketing; oversampled 4K is the answer

8K internal recording exists on the A1 II, Z8, R5 II — but most working video shooters downscale to 4K for delivery. Oversampled 4K (read from a 6K or 8K area, downscaled in-camera) delivers cleaner footage than native 4K. ProRes RAW, BRAW, and N-RAW internal recording now ships on multiple bodies; pick the codec your post pipeline already supports.

IBIS and weather sealing

In-body image stabilization (5–8 stops on flagship bodies) unlocks handheld shooting at slow shutter speeds and is now table-stakes above $1,500. Weather sealing rating matters if you shoot outdoors year-round; manufacturers rate it inconsistently, so check our review notes.

Lens ecosystem outlives the body

A body lasts 5–8 years. A great lens lasts 20+. Before buying a body, audit the lens roadmap: Sony E and Canon RF have the broadest catalogs; Nikon Z has caught up fast; L-mount (Panasonic, Leica, Sigma) is the open consortium; Fujifilm X is the only serious APS-C-native lineup.

How vsMars scores cameras

Sensor and autofocus weight highest because both define the keeper rate that matters years later. See the full formula on the methodology page, curated picks on best cameras, and detailed reviews in Mars Labs.