Pentax HD D FA 21mm f/2.4 ED Limited DC WR

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Prime lens

A prime lens by Pentax for Full frame cameras, 21mm f/2.4. A compact, weather-sealed wide prime for the full-frame bodies.

What it frames like

Its full-frame-equivalent focal length on the sensor it was made for.

How wide 21mm sees on each sensor it covers.

f/2.4 wide open, to scale against f/1.4.

On full frame (Pentax K): as marked, 21mm.
On APS-C (Pentax K): like 32mm on full frame; f/2.4 gives about the depth of field of f/3.6 there.

See what it frames: its view on the Pentax K-3 Mark III Monochrome at any distance, and its depth of field, drawn to scale.