cst1 likes camerasAsk a question

Pentax HD DA 21mm f/3.2 AL Limited

This page is a summary. For anything more specific, ask: /ask/what-is-the-pentax-hd-da-21mm-f-3-2-al-limited-good-for, or any question as words after /ask/.

Prime lens

A prime lens by Pentax for APS-C cameras, 21mm f/3.2.

MakerPentax
Focal length21mm (prime)
Maximum aperturef/3.2
Made forAPS-C sensors
MountsPentax K
Stabilisedno
Autofocusyes

What it frames like

142435508513520040080032mm equiv.21mm on APS-C
Its full-frame-equivalent focal length on the sensor it was made for.
APS-C 32mm · 59°
How wide 21mm sees on each sensor it covers.
f/3.2
f/3.2 wide open, to scale against f/1.4.
  • On APS-C (Pentax K): like 32mm on full frame; f/3.2 gives about the depth of field of f/4.8 there.
  • On the larger-sensor bodies of Pentax K: it works with the camera in a APS-C crop mode, at fewer megapixels.

Cameras it fits

Questions people ask

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.