Sigma 17-70mm F2.8-4 DC OS HSM C is a Variable aperture Auto Focus (AF)
Standard Zoom lens with Optical Image stabilization and APS-C / DX max sensor coverage, and it is designed to be used with Pentax KAF3 mount cameras.
What type of photography is the Sigma 17-70mm F2.8-4 DC OS HSM C lens good for?
The type of photography that you are planning to use the Sigma 17-70mm F2.8-4 DC OS HSM C is an important decision factor. Here we have evaluated its suitability to various photography scenarios:
| Photography Type |
Suitability |
| Bird/Wildlife | Average |
| Sports | Good |
| Portrait | Very Good |
| Travel | Very Good |
| Street | Good |
| Wedding | Very Good |
| Walk Around | Very Good |
| Vlogging | Fair |
| Landscape | Good |
| Macro | Average |
Lenses in Pentax KAF3 Mount with Same Focal and Aperture Range
Reasons to Buy Sigma 17-70mm F2.8-4 DC MACRO OS HSM C Lens
Here, we've included a summary of the advantages and disadvantages of the Sigma 17-70mm F2.8-4 DC MACRO OS HSM C lens in a list form to help you determine whether it offers the features you need.
| Optical Image Stabilization |
| Autofocus |
| Distance Scale |
| Hood supplied |
| Fast Aperture at Wide end |
| Fast Aperture at Tele end |
| Minimum focus distance of 0.22m / 8.7 inch |
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| Lens Extents while zooming |
| Variable Aperture |
Lens Mount
Sigma 17-70mm F2.8-4 DC OS HSM C is compatible with cameras that have Pentax KAF3 lens mount. Some of the latest released cameras that are compatible with the Pentax KAF3 lenses are , and .
Sigma 17-70mm F2.8-4 DC OS HSM C is also available in Canon EF , Sony Alpha, Sigma SA and Nikon F (DX) mounts.
Size, Weight and Filter Thread
Size and weight is a very important decision factor when searching for your next lens. Sigma 17-70mm F2.8-4 DC OS HSM C has a maximum diameter of 79mm and total length of 82mm when not extended . It weighs 465g / 16.4 oz.
Sigma 17-70mm F2.8-4 DC OS HSM C has a filter thread of 72mm.
Focal Range
Sigma 17-70mm F2.8-4 DC OS HSM C has a focal range of 17-70mm and 4.1X zoom ratio which has a 35mm equivalent focal range of 25.5-105mm when used on a APS-C / DX format camera.
Optical Image Stabilization
Sigma 17-70mm F2.8-4 DC OS HSM C features an optical image stabilization system which helps to reduce the blur that occurs due to shaking during hand-held shooting.
Zoom Method
Sigma 17-70mm F2.8-4 DC OS HSM C features Rotary (extending) zoom method where the length of the lens changes as you zoom in or out. This makes it possible to design the lens with a smaller minimum length ( generally when it is zoomed out) compared to internal zoom lenses. The disadvantages of this design are being harder to seal against dust and moisture, weight balance shifting while zooming and zoom creep in certain lenses.
Maximum Magnification Ratio
Sigma 17-70mm F2.8-4 DC OS HSM C has a Max Magnification Ratio of 0.36x and has a minimum focusing distance of 0.22m. For a non-macro lens, the 0.36x is considered a high magnification and will come handy for close-up shots.
Aperture
Sigma 17-70mm F2.8-4 DC OS HSM C is a variable aperture lens with a max aperture of f2.8 and a minimum aperture of f22 at 17mm, and a max aperture of f4 and minimum aperture of f22 at 70mm .
| Focal Length |
Max Aperture |
Min Aperture |
|
17mm
|
F2.8 |
F22 |
|
70mm
|
F4 |
F22 |
Optical Formula
Sigma 17-70mm F2.8-4 DC OS HSM C's optical formula consists of 16 elements in 14 groups . Following special elements are used in this design:
- 2 FLD ("F" Low Dispersion) glass elements
- 1 SLD (Special Low Dispersion)
glass element
- 3 aspherical glass lenses including double sided aspherical
lens
Lens Hood
Sigma 17-70mm F2.8-4 DC OS HSM C comes with a removable lens hood which is handy to reduce lens flare and glare in your photos. The model number of the hood is LH780-03.
Popular Comparisons of Sigma 17-70mm F2.8-4 DC OS HSM C
Here is the eight most popular comparisons of Sigma 17-70mm F2.8-4 DC OS HSM C amongst Camera Decision readers.