Photo: Stephan Sprinz (CC BY 4.0)
Quick answer
The Sigma 105mm f/2.8 EX DG OS HSM Macro is a short telephoto macro lens covering 105mm at f/2.8 for the Pentax K mount. Its bright maximum aperture handles indoor and evening light reasonably well.
About this lens
The Sigma 105mm f/2.8 EX DG OS HSM Macro is a full-frame macro lens covering 105mm at f/2.8 for Pentax K mount cameras, with Optical Stabilizer and Hyper Sonic Motor autofocus. A macro lens from Sigma for life-size close-ups.
Sigma 105mm f/2.8 EX DG OS HSM Macro specifications
- Brand
- Sigma
- Mount
- Pentax K
- Focal length
- 105mm
- Maximum aperture
- f/2.8
- Lens type
- Macro
- Format coverage
- full-frame
- Optical construction
- 16 elements in 11 groups
- Aperture blades
- 9
- Image stabilization
- Yes
- Autofocus motor
- HSM
- Minimum focus distance
- 0.31 m
- Maximum magnification
- 1x
- Filter thread
- 62 mm
- Weight
- 725 g
- Length
- 126.4 mm
- Diameter
- 78.3 mm
Specification source: sigmaphoto.com
What can you shoot with the Sigma 105mm f/2.8 EX DG OS HSM Macro?
At 105mm this is a short telephoto macro, which typically suits:
- Portraits with a flattering perspective
- Events and weddings
- Isolating subjects from the background
Its bright maximum aperture handles indoor and evening light reasonably well.
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 | 105mm | 19.5° | 23.3° |
| APS-C | 1.5x | 158mm | 13° | 15.6° |
Frequently asked questions
What mount does the Sigma 105mm f/2.8 EX DG 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 105mm f/2.8 EX DG OS HSM Macro?
It is a fixed 105mm lens with a maximum aperture of f/2.8. That makes it a short telephoto lens.
Is the Sigma 105mm f/2.8 EX DG OS HSM Macro a prime or a zoom lens?
It is a prime lens with a fixed 105mm focal length. Primes usually open wider than zooms; this one opens to f/2.8.
What is the Sigma 105mm f/2.8 EX DG OS HSM Macro equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 158mm on full frame, with a 13° horizontal and 15.6° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Sigma 105mm f/2.8 EX DG 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.
