Tamron 17-70mm F/2.8 Di III-A VC RXD Specs & DoF

17–70 mm

Focal length

f/2.8

Maximum aperture

79°–23°

Diagonal angle of view (APS-C)

APS-C

Designed for

4.1×

Zoom ratio

Specifications#

Brand: Tamron
Model: 17-70mm F/2.8 Di III-A VC RXD
Lens type: Standard zoom
Focal length: 17–70 mm
Maximum aperture: f/2.8
Image circle: APS-C (23.5×15.6 mm)
Mount(s): Nikon Z, Sony E-mount, Fujifilm X-mount, Canon RF
Projection: Rectilinear
Stabilisation: Yes (optical)
Autofocus motor: stepping (RXD)
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 17 mm	At 34 mm	At 70 mm	Equiv. aperture (DoF)
APS-C	26 mm · 79°	51 mm · 45°	105 mm · 23°	f/4.2
APS-C (Canon)	27 mm · 77°	54 mm · 43°	112 mm · 22°	f/4.5
Micro Four Thirds	34 mm · 65°	68 mm · 35°	140 mm · 18°	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: 16 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
17 mm	f/2.8	38.6 cm	1.75 m	87.1 m	∞	5.29 m	0.2%
17 mm	f/4	57.3 cm	3.02 m	∞	∞	3.71 m	0.2%
17 mm	f/8	1.48 m	∞	∞	∞	1.86 m	0.1%
34 mm	f/2.8	9.2 cm	37.6 cm	2.49 m	12.2 m	21.1 m	0.9%
34 mm	f/4	13.1 cm	54.2 cm	3.79 m	24.7 m	14.8 m	0.6%
34 mm	f/8	26.6 cm	1.15 m	12.3 m	∞	7.42 m	0.3%
70 mm	f/2.8	2.1 cm	8.6 cm	55.3 cm	2.25 m	89.5 m	3.9%
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 17 mm	NPF at 17 mm, f/2.8
APS-C	1/100 s	20 s	13 s
APS-C (Canon)	1/125 s	18 s	12 s
Micro Four Thirds	1/125 s	15 s	12 s

Compatible cameras#

Bodies in our database with a native Nikon Z, Sony E-mount, Fujifilm X-mount and Canon RF mount. Full-frame bodies switch to an APS-C crop with this lens.