TS-E17mm f/4L

TS-E17mm f/4L

This ultra wide-angle tilt-shift lens is uniquely designed to capture images of ultramodern high-rise architecture or historical buildings at an angle of view that surpasses human visual capabilities. An optical array incorporating a single GMo aspherical lens and four UD lenses minimizes distortion despite the ultra-wide perspective, producing high-resolution quality even in the peripheral areas of the image while simultaneously minimizing chromatic aberration. Special SWC coating minimizes flare and ghosting caused by direct light entering the lens at large angles of incidence. A TS rotation mechanism allows independent control of tilting and shifting from perpendicular to parallel, making it possible to suit a range of challenging situations.

SAMPLE PHOTOS

  • TS-E17mm f/4L, Canon EOS-1Ds Mark III, 10sec., f/11, ISO100
  • TS-E17mm f/4L, Canon EOS-1Ds Mark III, 20sec., f/14, ISO100

SPECS

Construction
(groups-elements)
12-18
Angle of View
(horizontal, vertical, diagonal)
93°/ 70°30’/ 104° (standard) *
No. of Diaphragm Blades 8
Closest Focusing Distance 0.25m
Maximum Magnification 0.14x
Water/dust Resistance -
Filter Size Filter not attached
Max. Diameter x Length Ø88.9 × 106.7mm
Weight Approx. 820g
Extension Tube EF12 II No
Extension Tube EF25 II No
Lens Cap Lens Cap 17
Lens Hood -
Lens Pouch/Case LP1219

  • UD element
  • GMo aspherical lens
  • SWC

MTF Characteristics

Spatial frequency Maximum aperture
S M
10 lines/mm
30 lines/mm
How to read
MTF characteristics

Spatial frequency Maximum aperture
S M
10 lines/mm
30 lines/mm

The more the S and M curves are in line, the more natural the blurred image becomes.

Modulation Transfer Function, or MTF, is a method of evaluating lens performance using contrast reproduction ratio. When evaluating the electrical characteristics of audio equipment, one important measure of performance is frequency response. This indicates the fidelity of the reproduced sound with respect to the source sound as it passes through the microphone, recording and playback circuits, and finally the speakers. When the reproduction is accurate, the equipment is classified as “hi-fi,” or “high fidelity.”
In the same way, when a lens is viewed as a transmission system for optical signals, measuring the frequency response of the optical system reveals whether the optical signal is transmitted faithfully. For a lens, the equivalent of frequency is “spatial frequency,” which indicates how many patterns, or cycles, of changes in sinusoidal density are present in a 1 mm width. Accordingly, the unit of spatial frequency is lines per mm, as opposed to Hz in electrical systems.

The MTF characteristics shown on this website are 10 lines/mm and 30 lines/mm, where the horizontal axis indicates image height (the distance on a diagonal line from the center of the image, in mm) with the image center set to 0, and the vertical axis indicates contrast. The closer the 10-line/mm curve is to 1, the better the contrast and clarity of the lens; the closer the 30-line/mm curve is to 1, the better the resolving power and sharpness of the lens. Although a good balance between both of these is important for a lens to be sharp and clear, a lens is generally said to offer excellent image quality if the 10-line/mm curve is greater than 0.8, or satisfactory image quality if greater than 0.6.

Resolving power and contrast are both good

Contrast is good; resolving power is poor

Resolving power is good; contrast is poor

  • *Image circle Ø67.2mm