Pentax smc Pentax-F ZOOM 35-70mm f/3.5-4.5 Specs & DoF

35–70 mm

Focal length

f/3.5–4.5

Maximum aperture

63°–34°

Diagonal angle of view (Full frame)

Full frame

Designed for

2.0×

Zoom ratio

Specifications#

Brand: Pentax
Model: smc Pentax-F ZOOM 35-70mm f/3.5-4.5
Lens type: Standard zoom
Focal length: 35–70 mm
Maximum aperture: f/3.5–4.5
Image circle: Full frame (36×24 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 35 mm	At 49 mm	At 70 mm	Equiv. aperture (DoF)
Full frame	35 mm · 63°	49 mm · 48°	70 mm · 34°	f/3.5
APS-C	52 mm · 44°	74 mm · 32°	105 mm · 23°	f/5.2
APS-C (Canon)	56 mm · 42°	78 mm · 31°	112 mm · 22°	f/5.6
Micro Four Thirds	70 mm · 34°	98 mm · 25°	140 mm · 18°	f/7.0

Depth of field & background blur#

Computed on its native Full frame format (CoC 30 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: 35 mm f/4 on full frame.

Focal	Aperture	at 1 m	at 2 m	at 5 m	at 10 m	Hyperfocal	Blur @2 m
35 mm	f/3.5	16.7 cm	69.3 cm	5.20 m	63.2 m	11.7 m	0.5%
35 mm	f/4	19.1 cm	80.0 cm	6.37 m	414 m	10.2 m	0.4%
35 mm	f/8	39.2 cm	1.81 m	181 m	∞	5.14 m	0.2%
49 mm	f/3.5	8.3 cm	34.4 cm	2.27 m	10.7 m	22.9 m	1.0%
49 mm	f/4	9.5 cm	39.4 cm	2.64 m	13.2 m	20.1 m	0.9%
49 mm	f/8	19.2 cm	81.1 cm	6.55 m	1.9 km	10.1 m	0.4%
70 mm	f/3.5	4.0 cm	16.6 cm	1.07 m	4.46 m	46.7 m	2.0%
70 mm	f/4	4.6 cm	18.9 cm	1.23 m	5.17 m	40.9 m	1.8%
70 mm	f/8	9.1 cm	38.2 cm	2.56 m	12.7 m	20.5 m	0.9%

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 35 mm	NPF at 35 mm, f/3.5
Full frame	1/80 s	14 s	9 s
APS-C	1/100 s	10 s	7 s
APS-C (Canon)	1/125 s	9 s	7 s
Micro Four Thirds	1/125 s	7 s	6 s

Compatible cameras#

Bodies in our database with a native Pentax K mount.

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-F 35-80mm f/4-5.6 f/4–5.6
Pentax F 28-80mm f/3.5-4.5 f/3.5–4.5
Pentax HD Pentax-D FA 28-105mm f/3.5-5.6 ED DC WR f/3.5–5.6
Pentax smc Pentax-FA 28-70mm f/4 AL f/4
Sigma 28-70mm f/2.8 EX DG f/2.8
Tamron SP AF 28-105mm f/2.8 LD Aspherical IF f/2.8
Tokina 28-70mm f/2.8 AT-X Pro SV f/2.8
Tokina AF 28-80mm f/2.8 AT-X 280 Pro f/2.8
Pentax HD Pentax-D FA 24-70mm f/2.8 ED SDM WR f/2.8
Sigma 24-60mm f/2.8 EX DG f/2.8
Sigma 24-70mm f/2.8 IF EX DG HSM f/2.8
Pentax HD Pentax-DA 20-40mm f/2.8-4 ED Limited DC WR f/2.8–4

Frequently asked questions#

Is the Pentax smc Pentax-F ZOOM 35-70mm f/3.5-4.5 full frame?

Yes — it covers the full 36 × 24 mm frame.

What is the Pentax smc Pentax-F ZOOM 35-70mm f/3.5-4.5 equivalent to on APS-C?

On a 1.5× APS-C body it frames like 52–105 mm, and like 56–112 mm on Canon APS-C.

What is the Pentax smc Pentax-F ZOOM 35-70mm f/3.5-4.5 good for?

As a standard zoom it suits everyday shooting, travel, events and walkaround use.

Sources & licences#

Lensfun lens database — CC BY-SA 3.0