Lenses -> Pentax 17-70mm F4 DA AL IF SDM Lens
A more versatile version of a standard zoom lens (equivalent to 26-105 in 35mm terms), the Pentax DA 17-70 f4 AL (IF) SDM Lens utilises the faster and quieter ultrasonic autofocus drive (SDM). The inclusion of the two aspherical lens elements ensure sharp clear images throughout the entire zoom range, while the constant f4 aperture means easier control in both manual and aperture priority modes.
|Specification / Feature||Value||Scores *||Rank **|
|Number of Lens Groups||12|
|Number of Lens Elements||17|
|Optical Zoom ||4.12||14.70||30|
|Max Aperture ||4||70.68||26|
|Max Aperture Wide ||4||70.68||26|
|Max Aperture Tele ||4||32.53||27|
|Focal Length Wide ||17 (or 25.5 in full frame equiv.)||70.24||25|
|Focal Length Tele ||70 (or 105 in full frame equiv.)||58.21||34|
|Min Aperture ||22|
|Magnification Ratio ||0.31x||5.25||16|
|Min Focus Distance ||0.3m||95.85||23|
|Sensor Format ||APS-C|
|Autofocus Motor ||SDM|
|1st/3rd Party ||1st party|
|Lens Type ||Standard Zoom|
|Image Stabilisation ||No|
|Video Lens ||No|
|Tilt Shift ||No|
|Weather Resistant ||No|
|Filter Thread Size (mm) ||67mm|
|Size (DxL) ||0mm|
|Lens Mount ||Pentax K (DA)|
|UK Price ||£479.00 at Wex Photo Video (affiliate link)||49.65||164|
* - Scores are calculated by comparing numerical specifications with other cameras. The highest ranking camera for a specification acheives a score of 100. The lowest ranking camera is scored as 0 and all the other cameras are scored in between 0 and 100 according to their merit.
** - Rank is calculated by ordering the scores for all cameras in descending order. The best scoring camera for a particular feature / specification will have a rank of 1.
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