The Pentax 18-270mm zoom is designed exclusively for digital cameras and only covers the APS-C image circle.
This lens foregoes the traditional Pentax screw drive focusing mechanism and features a built-in super sonic focusing motor (SDM) only. This means that this lens will not autofocus on certain early Pentax DSLRs: the K100D, K110D, and *istD series.
Below are the official lens specifications:
|Lens Name||SMC PENTAX-DA 18-270mm F3.5-6.3 ED SDM|
|Optical Formula||16 elements in 13 groups. |
Two of the elements are ED
(extra low dispersion)
|Image Circle||APS-C Only|
|Autofocus||Built-In SDM Motor|
|Field of View||67° to 5° horizontal, 75° to 5.5° diagonal|
|Aperture Range||F3.5 - F22 at 18mm |
F6.3 - F45 at 270mm
|Aperture Blades||7, rounded|
|Minimum Focusing Distance||49cm|
|Cap||Plastic, pinch type|
|Hood||PH-RBD 62mm, included, petal-style|
|Diameter x Length||75.8 x 89mm / 3 x 3.5 in|
|Weight||453g / 16oz|
|Price||Current (US): $799.95|
As this is a DA-series lens, modern Pentax DSLRs will support in-camera distortion and aberration correction when used with this lens.