Used Sigma 20mm f/1.8 EX DG for Sale — From £114 | UsedLens.co.uk

£114.00 Low price

£572.99 High price

15 Listings

3 Retailers

8 Reduced

Great for: landscape astro street general

Sigma's older 20mm f/1.8 wide prime for DSLR — pre-Art era with fast aperture for astrophotography.

The Sigma 20mm f/1.8 EX DG Aspherical RF was released circa 2002 as an ultra-wide fast prime for full-frame Canon EF bodies. Thirteen elements in 11 groups. Nine aperture blades. 82mm filter thread. At 520g. 0.20m MFD (1:4 maximum magnification). Conventional AF drive (no HSM).

The optical design uses 13 elements in 11 groups. Nine aperture blades. The 82mm filter thread. At 520g the lens is moderate. Minimum focus distance of 0.20m (1:4 magnification). Conventional AF drive — no HSM. f/1.8 maximum aperture. Full-frame coverage. EX series designation.

The Sigma 20mm f/1.8 EX DG was the fastest 20mm prime available for Canon EF at launch: f/1.8 at 20mm provides a wide-angle option with light-gathering ability suited to astrophotography and indoor available-light photography. The 82mm filter thread is large, reflecting the optical demands of an f/1.8 full-frame 20mm front element.

On the used market the Sigma 20mm f/1.8 EX DG is very affordable as a vintage full-frame fast ultra-wide. Condition checks: conventional AF motor response (audible), 82mm front element for marks. Compatible with Canon EOS EF and EF-S bodies; on RF bodies via EF-RF adapter.

Avg £161, down 1.8% over 2 weeks

Price history ↓

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Used Sigma 20mm f/1.8 EX DG price history

Tracking the used Sigma 20mm f/1.8 EX DG price? Over the past two weeks, the average has fallen 1.8%, from £164 to around £161. Depending on age and condition, expect to pay between £146 and £189 for a used lens.

Average market price (line) and typical price range (shaded). Source: UsedLens daily price index, 11 Jun – 3 Jul 2026.