The new lens achieves a minimum focus distance of 27cm (10.6") over the entire zoom range, one of the best in its class among fast standard zoom lenses with an F/2.8 maximum aperture throughout the entire zoom range used exclusively for digital SLR cameras with APS-C sized image sensors. The maximum magnification ratio of 1:4.5* 1 at the 50mm setting is the top level in its class.
* 1 Since APS-C sized image sensors are smaller than 35mm film, the 17-50mm can fill the frame with almost the same scope as a lens with a Max. Mag. Ratio of 1:3.0 on a 35mm SLR camera .
● Internal Surface Coating to Reduce Ghosting and Flare
By employing “Internal Surface Coatings” (i.e., multiple-layer coatings on cemented surfaces of plural elements) and new multiple-layer coating technology on ordinary elements, ghosting and flare due to the reflections that occur when light enters through the front element and reflections caused by the imagers themselves are reduced to the absolute minimum.
● Large Aperture in Lightweight, Compact Design Thanks to New Mechanical Devices
Complicated mechanisms are built into the compact body, thanks to new mechanical devices, for excellent portability and ease of use. In addition, a complex triple cam structure where cam's zoom and focus within a three-layer lens barrel has been further developed to improve AF focus precision for close-in shots and torque irregularity when zooming in and out. Additionally, the engineering of the lens has been completely redesigned to downsize its parts and to increase their precision and durability, in order to accommodate the complex structure incorporated into the new SP AF17-50mm F/2.8 XR Di-II LD Aspherical [IF].
Model Name: A16
Focal Length: 17-50mm
Maximum Aperture: F/2.8
Angle of View: 78 ° 45'-31 ° 11'
Lens Construction: 16 elements in 13 groups
Minimum Focus Distance: 0.27m (10.6”) (the entire zoom range)
Maximum Mag. Ratio: 1:4.5 (at f=50mm MFD 0.27m)
Filter Diameter: 67mm
Overall Length: 83.2mm (3.3”)*
Maximum Diameter: 73.8mm (2.9”)
Weight: 430g (15.2 oz.)*
Diaphragm Blades: 7 blades
Minimum Aperture: F/32
Standard Accessory: Flower-shaped Lens Hood
Compatible Mount: Canon, Nikon, and Sony Konica Minolta
* Values given are for Nikon mount.