Specifications:

Brand Canon
Focal Length 17mm
Aperture Maximum: f/4
Minimum: f/22
Camera Mount Type Canon EF
Format Compatibility 35mm Film / Full-Frame Digital Sensor
Angle of View 104°
Tilt/Shift Tilt ± 6.5°
Shifts ± 12mm
Minimum Focus Distance 9.84″ (25 cm)
Magnification 0.14x
Maximum Reproduction Ratio 1:7.1
Optical Design 18 Elements in 12 Groups
Diaphragm Blades 8, Rounded
Autofocus No
Filter Thread None
Dimensions (DxL) Approx. 3.50 x 4.21″ (88.9 x 106.9 mm)
Weight 1.80 lb (820 g)
Package Weight 1.25 kg
Box Dimensions (LxWxH) 8.189 x 5.512 x 5.354″

Features:

Perspective control, tilt-shift lens affords +/- 12mm of shift and +/- 6.5° of tilt, and both types of movements can be applied independently, and parallel or perpendicular to one another. Additionally, the tilt and shift functions can be rotated +/- 90° for applying the movements in distinct directions.

Tilt-locking mechanism ensures the lens stays in place while shooting.

Four Ultra-Low Dispersion elements are used to greatly reduce color fringing and chromatic aberrations in order to achieve greater clarity and color accuracy.

One aspherical element limits distortion and spherical aberrations to realize greater sharpness and accurate rendering.

A Sub Wavelength Coating has been applied to individual elements to control lens flare and ghosting for greater contrast and color fidelity when working in strong lighting conditions.

Floating optical system, along with a rear focusing mechanism, maintains consistent image quality throughout the focusing range, from 9.8″ to infinity.

As a member of the esteemed L-series, this lens is sealed against dust and moisture for working in inclement environmental conditions.

Rounded eight-blade diaphragm contributes to a pleasing out of focus quality that benefits the use of shallow depth of field techniques.