Specifications#
Equivalent focal length on different cameras#
Field of view and depth-of-field equivalence when this lens is used on bodies with different sensor sizes (natively or via an adapter).
| Camera format | At 11 mm | At 14 mm | At 18 mm | Equiv. aperture (DoF) |
|---|---|---|---|---|
| APS-C | 16 mm · 104° | 21 mm · 90° | 27 mm · 76° | f/4.2 |
| APS-C (Canon) | 18 mm · 101° | 22 mm · 88° | 29 mm · 73° | f/4.5 |
| Micro Four Thirds | 22 mm · 89° | 28 mm · 75° | 36 mm · 62° | f/5.6 |
Depth of field & background blur#
Computed on its native APS-C format (CoC 20 µm). “Blur @2 m” is the size of an out-of-focus point at infinity, as a percentage of frame width, with the subject at 2 m — a simple bokeh index. Full table: 14 mm f/2.8 on aps-c.
| Focal | Aperture | at 1 m | at 2 m | at 5 m | at 10 m | Hyperfocal | Blur @2 m |
|---|---|---|---|---|---|---|---|
| 11 mm | f/2.8 | 1.12 m | 19.0 m | ∞ | ∞ | 2.22 m | 0.1% |
| 11 mm | f/4 | 2.16 m | ∞ | ∞ | ∞ | 1.56 m | 0.1% |
| 11 mm | f/8 | ∞ | ∞ | ∞ | ∞ | 78.4 cm | 0.0% |
| 14 mm | f/2.8 | 59.6 cm | 3.21 m | ∞ | ∞ | 3.59 m | 0.1% |
| 14 mm | f/4 | 93.1 cm | 8.53 m | ∞ | ∞ | 2.52 m | 0.1% |
| 14 mm | f/8 | 4.14 m | ∞ | ∞ | ∞ | 1.27 m | 0.1% |
| 18 mm | f/2.8 | 34.1 cm | 1.51 m | 28.9 m | ∞ | 5.93 m | 0.2% |
| 18 mm | f/4 | 50.2 cm | 2.48 m | ∞ | ∞ | 4.16 m | 0.2% |
| 18 mm | f/8 | 1.22 m | 45.6 m | ∞ | ∞ | 2.09 m | 0.1% |
Handheld & night-sky limits#
NPF assumes typical 20–24 MP sensors (≈6 µm pixels on full frame, ≈3.9 µm on APS-C, ≈3.3 µm on Micro Four Thirds).
| Body | Min. handheld shutter (longest focal) | 500 rule at 11 mm | NPF at 11 mm, f/2.8 |
|---|---|---|---|
| APS-C | 1/25 s | 30 s | 20 s |
| APS-C (Canon) | 1/30 s | 28 s | 19 s |
| Micro Four Thirds | 1/40 s | 23 s | 18 s |
Compatible cameras#
Bodies in our database with a native Pentax K mount. Full-frame bodies switch to an APS-C crop with this lens.
- Ricoh Pentax KF 2022
- Ricoh Pentax K-3 Mark III 2021
- Pentax K-1 II crop mode
- Ricoh Pentax KP 2017
- Ricoh Pentax K-1 crop mode
- Ricoh Pentax K-70 2016
- Ricoh Pentax K-3 II 2015
- Pentax K-3 2013
- Pentax K-50 2013
- Pentax K-01 2012
- Pentax K-5 II 2012
- Pentax K-30 2012
- Pentax K-5 IIs 2012
- Pentax K-5 2010
- Pentax K-r 2010
- Pentax K-x 2010
- Pentax K200D 2008
- Pentax K20D 2008
- Pentax K-m 2008
- Pentax K110D 2006
- Pentax K100D 2006
- Pentax K10D 2006
- Pentax *ist DL2 2006
- Pentax *ist DL 2005
- Pentax *ist DS 2004
- Pentax *ist D 2003
- Pentax MZ-S crop mode
- Pentax LX crop mode
- Pentax ME crop mode
- Ricoh XR-1 crop mode
- Pentax MX crop mode
- Pentax K-7
- Pentax K-S1
- Pentax K-S2
- Pentax K2000
- Pentax *ist DS2
- Pentax K100D Super
- Samsung GX-10
- Samsung GX-1L
- Samsung GX-1S
Adapt it to other systems#
Similar lenses#
- Tamron SP AF 11-18mm f/4.5-5.6 Di-II LD Aspherical (IF) f/4.5–5.6
- Pentax smc Pentax-DA 12-24mm f/4 ED AL IF f/4
- Sigma 12-24mm F4.5-5.6 II DG HSM f/4.5–5.6
- Sigma 12-24mm f/4.5-5.6 EX DG Aspherical HSM f/4.5–5.6
- Pentax smc Pentax-DA Fish-Eye 10-17mm f/3.5-4.5 ED IF f/3.5–4.5
- Sigma 10-20mm f/3.5 EX DC HSM f/3.5
- Sigma 10-20mm f/4-5.6 EX DC f/4–5.6
- Tamron SP AF 10-24mm f/3.5-4.5 Di II LD Aspherical (IF) f/3.5–4.5
- Pentax HD Pentax-D FA 15-30mm f/2.8 ED SDM WR f/2.8
- Sigma 15-30mm f/3.5-4.5 EX DG Aspherical f/3.5–4.5
- Sigma 8-16mm f/4.5-5.6 DC HSM f/4.5–5.6
- Sigma 17-35mm F2.8-4 EX DG Aspherical HSM f/2.8–4
Frequently asked questions#
Is the Pentax HD Pentax-DA* 11-18mm f/2.8 ED DC AW full frame?
No — it is designed for APS-C sensors. On a full-frame body it vignettes or triggers crop mode.
What is the Pentax HD Pentax-DA* 11-18mm f/2.8 ED DC AW equivalent to on APS-C?
Its focal length is already the real value for APS-C: 11–18 mm frames like 17–28 mm on full frame.
What is the Pentax HD Pentax-DA* 11-18mm f/2.8 ED DC AW good for?
As a wide-angle zoom it suits landscapes, architecture, interiors and astrophotography.
Sources & licences#
- Lensfun lens database — CC BY-SA 3.0
Last updated October 03, 2026 · How we calculate · Sources