Pentax 20-40mm f2.8-4.0 ED DA HD

Sharp throughout zoom range. Weather-sealed design. Compact. Metal lens barrel.

Pricey. Some distortion at the wide end. Modest zoom range.

The Pentax HD DA 20-40mm F2.8-4 ED Limited DC WR is a compact, weather-sealed zoom lens, but its range is limited and it's priced on the high side.

Very good sharpness in the centre at maximum aperture, Excellent sharpness when stopped down, Very good build, Weather resistant construction, Low CA, Retro styling

Expensive for a variable aperture standard zoom, Odd zoom range is not really very wide, nor very telephoto, Neither focus or zoom are performed internally