Pentax HD D FA 70-210mm f/4 ED SDM WR

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Zoom lens

A zoom lens by Pentax for Full frame cameras, 70-210mm f/4. A lighter alternative to the f/2.8 telephoto zoom.

What it frames like

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

How wide 70mm sees at its wide end on each sensor it covers.

f/4 wide open, to scale against f/1.4.

On full frame (Pentax K): as marked, 70-210mm.
On APS-C (Pentax K): like 105-315mm on full frame; f/4 gives about the depth of field of f/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.