Sigma 18-35mm F1.8 DC HSM "Art"
Specifications
Being one of their newest lenses and a member of the Global Vision lineup, the Sigma 18-35mm F1.8 DC HSM "Art" lens features many of Sigma's quality lens features and technologies. For those unable to decipher the alphabet soup above in that name, we've identified what it all means below:
F | "F-Stop," signifying the widest (fastest) aperture of this lens. Despite being a zoom lens, the lack of multiple numbers (thus a range) in the aperture signify a constant aperture throughout the zoom range. |
DC | "Digital Crop," signifying that this lens is for APS-C cameras (a "crop" of the full frame sensor due to being slightly smaller in physical size). |
HSM | "Hyper Sonic Motor," which indicates the inclusion of Sigma's latest autofocusing technology for its lenses - an in-lens focus motor that promises fast and silent autofocus. *Discussed more in detail on the Autofocus page of this review. |
Art | Part of Sigma's Global Vision of lenses, the "Art" category is one of three, along with "Contemporary" and "Sport." |
Lens Specifications and HD 20-40 WR Comparison
Below are the official specifications for the Sigma 18-35 "Art." Additionally, for your comparing convenience, we provided the specifications for Pentax's premium standard zoom that also features a 2x zoom range.
| Official Lens Name | Sigma 18-35 F1.8 "Art"
| Pentax HD 20-40 WR
|
| Optical Formula | 17 elements in 12 groups | 9 elements in 8 groups |
| Extra Dispersion | Yes - Four | Yes - Two |
| Asperical Lens | Yes - Five | Yes - One |
| Super Protect | No | Yes |
| Image Circle | APS-C only | APS-C only |
| Autofocus | Built-in HSM Motor (w/ K10D or newer) | Built-in DC Motor (w/ K10D or newer) |
| Field of View |
|
|
| Maximum | F1.8 | F2.8-4 - see Construction/Handling Pg |
| Minimum | F16 | F22-32 - see Construction/Handling Pg |
| Aperture Blades | 9 (rounded) | 9 (rounded) |
| Aperture Ring | No - controlled via camera body | No - controlled via camera body |
| Max. Magnification | 0.23x (1:4.3) | 0.20x (1:5) |
| Minimum | 27.9 cm (11 in) | 28.0 cm (11 in) |
| Internal Focus | Yes | No |
| Internal Zoom | Yes | No |
| Filter Diameter | 72mm | 55mm |
| Lens Cap | Included, plastic pinch type | O-LW65A, included, plastic pinch type |
| Lends Hood | Included, petal | MH-RA55, included, petal |
| Case | Yes | Yes (P70-150) |
| Diameter x Length | 78 x 121 mm (3.1 x 4.8 in) | 71 x 68.5 mm (2.8 x 2.7 in) |
| Weight | 811 g (1.78 lb) | 283 g (0.63 lb) |
| Mount Designation | KAF3 | KAF3 |
| Full Time Manual | Yes | Yes |
| Weather Sealing | No | Yes |
| Tripod Collar | No | No |
| Price |
|
|
As the Sigma 18-35 is not a Pentax series lens, modern Pentax DSLRs will not support in-camera distortion and aberration corrections in JPEG mode with this lens.
Continue on to the next page to see what's in the box.
