Pentax HD Pentax-DA 70mm f/2.4 Limited Specs & DoF

70 mm

Focal length

f/2.4

Maximum aperture

23°

Diagonal angle of view (APS-C)

APS-C

Designed for

Specifications#

Brand: Pentax
Model: HD Pentax-DA 70mm f/2.4 Limited
Lens type: Portrait / short tele prime
Focal length: 70 mm
Maximum aperture: f/2.4
Image circle: APS-C (23.5×15.6 mm)
Mount(s): Pentax K
Projection: Rectilinear
Lensfun correction profile: Yes — distortion/vignetting/TCA

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.

Adapt it to other systems#

Sony E-mount Canon RF Nikon Z Fujifilm X-mount Micro Four Thirds L-Mount Canon EF-M Fujifilm G-mount Hasselblad XCD Nikon 1 (CX)Pentax Q Samsung NX Canon EF Nikon F

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