What is the cheapest used Pentax SMC Pentax-M 20mm f/4 in the UK?

The cheapest used Pentax SMC Pentax-M 20mm f/4 currently listed is £254.99 at eBay, based on 3 listings compared across 2 UK retailers.

How many used Pentax SMC Pentax-M 20mm f/4 are for sale in the UK?

There are currently 3 used Pentax SMC Pentax-M 20mm f/4 listings available across 2 UK retailers on UsedLens, updated daily.

Is the used Pentax SMC Pentax-M 20mm f/4 going up or down in price?

Over the past two weeks the average used price has fallen 9.5%, from £294 to around £266, based on UsedLens daily price tracking across UK retailers.

Used Pentax SMC Pentax-M 20mm f/4 for Sale — From £255

£254.99 Low price

£322.00 High price

3 Listings

2 Retailers

1 New this week

1 Reduced

Great for: landscape architecture travel street

Pentax's compact M-series wide prime — a manual-focus 20mm f/4 with Super Multi Coating.

The SMC Pentax-M 20mm f/4 is a compact wide-angle prime for the Pentax K bayonet mount, from the M-series generation designed to be small and light to match Pentax's downsized MX and ME bodies of the late 1970s. It offered a wide field in a notably pocketable barrel.

This is a manual-focus lens with a 20mm focal length and a maximum aperture of f/4, coated with Pentax's Super Multi Coating. The M line was built around compactness, so the lens is physically small; confirm the exact filter thread and construction against the individual sample rather than assuming.

At 20mm the rectilinear field is wide without extreme distortion, useful for street work, interiors, landscape and travel where a small kit matters. The moderate f/4 speed keeps the optics simple and the barrel short while still giving a generous angle of view.

The M-series wide primes are popular with users who adapt vintage glass because of their small size and solid build. Inspect for haze, fungus and coating scratches, test the aperture blades for oil, and feel the focus ring for smooth damping. It fits Pentax K digital bodies and adapts readily to mirrorless cameras.

Avg £266, down 9.5% over 2 weeks

Price history ↓

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Used Pentax SMC Pentax-M 20mm f/4 price history

Tracking the used Pentax SMC Pentax-M 20mm f/4 price? Over the past two weeks, the average has fallen 9.5%, from £294 to around £266. Depending on age and condition, expect to pay between £260 and £294 for a used lens.

Average market price (line) and typical price range (shaded). Source: UsedLens daily price index, 8 Jul – 26 Jul 2026.