Quick answer
The Sigma 18-250mm f/3.5-6.3 DC OS HSM Macro is a ultra-wide to telephoto macro lens covering 18-250mm at f/3.5 for the Pentax K mount. Its moderate maximum aperture works best in good light or with a higher ISO.
About this lens
Sigma 18-250mm f/3.5-6.3 DC OS HSM Macro: an APS-C macro zoom lens with a 18-250mm focal length and a maximum aperture of f/3.5-6.3, made for Pentax K mount cameras, with Optical Stabilizer and Hyper Sonic Motor autofocus. A high-ratio walk-around zoom for APS-C cameras.
Sigma 18-250mm f/3.5-6.3 DC OS HSM Macro specifications
What can you shoot with the Sigma 18-250mm f/3.5-6.3 DC OS HSM Macro?
At 18-250mm this is a ultra-wide to telephoto macro, which typically suits:
- Landscapes and big skies
- Architecture and interiors
- Astrophotography and night skies
- Landscapes and cityscapes
- Street and travel photography
Its moderate maximum aperture works best in good light or with a higher ISO.
Full-frame equivalent and field of view
Calculated from the focal length and crop factor. Not measured.
| Sensor | Crop | Equivalent | Horizontal FOV | Diagonal FOV |
|---|---|---|---|---|
| Full frame | 1.0x | 18–250mm | 8.2–90° | 9.9–100.5° |
| APS-C | 1.5x | 27–375mm | 5.5–67.4° | 6.6–77.4° |
Frequently asked questions
What mount does the Sigma 18-250mm f/3.5-6.3 DC OS HSM Macro use?
It uses the Pentax K mount, so it fits Pentax K cameras directly.
What is the focal length of the Sigma 18-250mm f/3.5-6.3 DC OS HSM Macro?
It zooms across 18-250mm with a maximum aperture of f/3.5. That makes it a ultra-wide to telephoto lens.
Is the Sigma 18-250mm f/3.5-6.3 DC OS HSM Macro a prime or a zoom lens?
It is a zoom lens covering 18-250mm, so you can reframe without moving. Its maximum aperture is f/3.5.
What is the Sigma 18-250mm f/3.5-6.3 DC OS HSM Macro equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 27–375mm on full frame, with a 5.5–67.4° horizontal and 6.6–77.4° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Sigma 18-250mm f/3.5-6.3 DC OS HSM Macro fit?
Any Pentax K-mount camera, including Pentax K-1, Pentax K-3, Pentax K-3 II, Pentax K-3 Mark III, and Pentax K-30 and 15 more.
Alternatives for Pentax K from other brands
All Pentax K lensesSame mount, overlapping focal range, closest maximum aperture first.
More Sigma lenses for Pentax K
All Sigma lenses
Other 18-250mm lenses
Browse by focal length: 18mm lenses, 250mm lenses