Sigma 17-50mm f/2.8 EX DC OS HSM vs Tamron 18-270mm f/3.5-6.3 Di II VC PZD
Both are Pentax K lenses for APS-C. Here is what actually differs.
Pick the Sigma 17-50mm f/2.8 EX DC OS HSM if
- You need ⅔ stop more light for low light or background blur (f/2.8 vs f/3.5)
- You want a wider view: 17mm vs 18mm at the wide end
- You shoot close-ups: it focuses down to 0.28 m vs 0.49 m
Pick the Tamron 18-270mm f/3.5-6.3 Di II VC PZD if
- You need more reach: 270mm vs 50mm at the long end
Spec differences
13 differences| Sigma 17-50mm f/2.8 EX DC OS HSM | Tamron 18-270mm f/3.5-6.3 Di II VC PZD | |
|---|---|---|
| Brand |
Sigma
|
Tamron
|
| Type |
Zoom
|
Superzoom
|
| Focal length |
17-50mm
|
18-270mm
|
| Max aperture |
f/2.8
⅔ stop faster
|
f/3.5
|
| Weight |
565 g
|
not listed
|
| Length |
91.8 mm
|
not listed
|
| Diameter |
83.5 mm
|
not listed
|
| Filter thread |
77 mm
|
62 mm
|
| Min focus distance |
0.28 m
closer
|
0.49 m
|
| Max magnification |
0.2×
|
not listed
|
| Aperture blades |
7
|
not listed
|
| Optical design |
17 elements / 13 groups
|
not listed
|
| Autofocus motor |
HSM
|
PZD
|
3 identical specs hidden: mount, format, image stabilization. Show all
- Mount
- Pentax K both
- Format
- APS-C both
- Image stabilization
- Yes both
Our notes
Sigma 17-50mm f/2.8 EX DC OS HSM
Sigma 17-50mm f/2.8 EX DC OS HSM: an APS-C fast standard zoom lens with a 17-50mm focal length and a maximum aperture of f/2.8, made for Pentax K mount cameras, with Optical Stabilizer and Hyper Sonic Motor autofocus. A bright standard zoom for APS-C cameras with a constant f/...
Our notes
Tamron 18-270mm f/3.5-6.3 Di II VC PZD
Tamron 18-270mm f/3.5-6.3 Di II VC PZD: an APS-C superzoom lens with a 18-270mm focal length and a maximum aperture of f/3.5-6.3, made for Pentax K mount cameras, with Vibration Compensation and quiet motor-driven autofocus. A high-ratio travel zoom covering wide-angle to tele...
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