18-50mm f/2.8 DC DN Contemporaryvs A7 III

GearFrame · Updated March 2026

Sigma 18-50mm f/2.8 DC DN Contemporary Sigma 18-50mm f/2.8 DC DN Contemporary (2021) Starting from £649 new Best for Everyday, travel & events on Fujifilm or Sony APS-C View 18-50mm f/2.8 DC DN Contemporary
VS
Sony A7 III Sony A7 III (2018) Starting from £1699 new Best for All-round photography & video View A7 III

GearScore™ Verdict — Which should you buy?

Everyday, Travel & Events On Fujifilm Or Sony Aps-C — 18-50mm f/2.8 DC DN Contemporary (2021): The lightest f/2.8 standard zoom ever made — 290g is astonishing for a lens of this capability, and it optically over-delivers at the price.

All-Round Photography & Video — A7 III (2018): Still one of the best all-round cameras money can buy — particularly strong used. The A7 III proved that full-frame doesn't have to mean compromises, and nothing at this price point has meaningfully beaten it.

↓ Full specifications below

A7 III (2018)

  • Enthusiast photographers upgrading from APS-C for the first time
  • Working photographers who need reliable AF and weather sealing
  • Anyone who shoots in low light regularly
  • Hybrid shooters needing both stills and video performance

Quick take: The 18-50mm f/2.8 dc dn contemporary is the most affordable; only the a7 iii is weather sealed. Scroll down for the full spec breakdown.

Full specifications

Specification 18-50mm f/2.8 DC DN Contemporary (2021)A7 III (2018)
Price £649 £1,699
Sensor Fujifilm X mount (APS-C) 24.2MP Full-Frame Exmor R BSI CMOS
Resolution 24.2MP
Video N/A — lens 4K/30p (6K oversampled), 1080p/120p slow-motion
Autofocus Stepping motor — fast, quiet, video-friendly Phase-detect, 693 points, real-time Eye AF & animal AF
Stabilisation None 5-axis IBIS, 5 stops
Burst Rate N/A 10fps with AF/AE tracking
Battery Life N/A ~710 shots (CIPA)
Weight 290g 565g (body, battery, card)
Dimensions 65.4mm diameter × 76.8mm length 126.9 × 95.6 × 73.7mm
Weather Sealed No Yes
Viewfinder N/A EVF, 2.36M dots, 0.78× magnification
Screen N/A 3.0" tilting touchscreen, 921k dots
Mount 55mm filter thread Sony E-mount
Memory Cards N/A Dual SD (UHS-II slot 1, UHS-I slot 2)
Connectivity N/A USB-C (USB 3.2), Wi-Fi, Bluetooth, NFC
Genre 18-50mm f/2.8 DC DN ContemporaryA7 III
Travel
9.0
9.0
Street
9.0
9.0
Portrait
7.0
9.0
Wildlife
7.0
Video
7.0
⚡ Compare specs side by side 18-50mm f/2.8 DC DN Contemporary prices → A7 III prices →

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