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 70 mm | Equiv. aperture (DoF) |
|---|---|---|
| APS-C | 105 mm · 23° | f/3.6 |
| APS-C (Canon) | 112 mm · 22° | f/3.8 |
| Micro Four Thirds | 140 mm · 18° | f/4.8 |
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: 85 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 |
|---|---|---|---|---|---|---|---|
| 70 mm | f/2.4 | 1.8 cm | 7.4 cm | 47.3 cm | 1.92 m | 104 m | 4.5% |
| 70 mm | f/4 | 3.0 cm | 12.3 cm | 79.2 cm | 3.25 m | 62.7 m | 2.7% |
| 70 mm | f/8 | 5.9 cm | 24.7 cm | 1.61 m | 7.05 m | 31.4 m | 1.4% |
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 70 mm | NPF at 70 mm, f/2.4 |
|---|---|---|---|
| APS-C | 1/100 s | 5 s | 3 s |
| APS-C (Canon) | 1/125 s | 4 s | 3 s |
| Micro Four Thirds | 1/125 s | 4 s | 3 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#
- Pentax smc Pentax-DA 70mm f/2.4 Limited f/2.4
- Pentax smc Pentax-FA 77mm f/1.8 Limited f/1.8
- Samyang 85mm f/1.4 IF UMC Aspherical f/1.4
- Sigma 85mm f/1.4 EX DG HSM f/1.4
- Pentax smc Pentax-DA* 55mm f/1.4 SDM f/1.4
- Pentax smc Pentax-DA 50mm f/1.8 f/1.8
- Samyang 135mm f/2 ED UMC f/2
- Pentax Takumar 135mm f/2.5 Bayonet f/2.5
- Pentax smc Pentax-M 135mm f/3.5 f/3.5
Frequently asked questions#
Is the Pentax HD Pentax-DA 70mm f/2.4 Limited 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 70mm f/2.4 Limited equivalent to on APS-C?
Its focal length is already the real value for APS-C: 70 mm frames like 107 mm on full frame.
What is the Pentax HD Pentax-DA 70mm f/2.4 Limited good for?
As a portrait / short tele prime it suits head-and-shoulders portraits with flattering perspective and creamy backgrounds.
Sources & licences#
- Lensfun lens database — CC BY-SA 3.0
Last updated October 03, 2026 · How we calculate · Sources