Canon TS-E 90mm f/2.8 - Review / Lab Test Report
Lens Reviews -
Canon EOS (APS-C)
Wednesday, 26 December 2007 04:32
Page 1 of 2
Special thanks to Markus Stamm for providing this lens!
The Canon TS-E 90mm f/2.8 is one of the more unusual lenses in the Canon lens
lineup - it is one of three tilt-shift (TS) lenses.
Shift lenses allow you to compensate perspective distortions (converging verticals) by
shifting the optical path off its horizontal axis. By doing so the projected image (rectangle)
on the film/sensor plane gets distorted to a trapezoid negating the original effect.
You may argue that you can also apply perspective correction via an imaging application
these days. This may be true but you're doing so at cost of image quality because a
stretched image portions rely on interpolated data.
Unlike most other shift lenses Canon TS-E lenses also offer a tilt feature allowing
to alter the focus plane. On normal lenses the focus plane is parallel to the
film/sensor plane. By tilting the lens you can coincide the focus plane to the
layout of your main subject in your scene which may not be parallel to the film/sensor
plane (Scheimpflug effect). This way you can optimize your depth-of-field although you're not increasing it.
If you tilt and/or shift the lens it has quite a bizarre look (see below).
There's a side effect to the TS mechanism - this lens offers manual focusing only
which is why it is not an EF (electronic focus) lens. The aperture
mechanism remains under electronic camera control so it still deserves the E
in the TS-E naming.
The build quality of the lens is exceptionally high - this is certainly a requirement
anyway because of the number of moving parts here. Most of the outer construction
is made of metal. The broad, rubberized focus ring operates very smooth. The lens
extends significantly when focusing towards closer distances.
|Equiv. focal length||144 mm (full format equivalent)|
|Equiv. aperture||f/4.5 (full format equivalent, in terms of depth-of-field)|
|Optical construction||6 elements in 5 groups|
|Number of aperture blades||8|
|min. focus distance||0.5 m (max. magnification ratio 1:3.4)|
|Dimensions||74 x 88 mm|
|Filter size||58 mm (non-rotating)|
|Hood||barrel shaped, snap-on type|
|Other features||Tilt-Shift mechanism|