Check out the full review here.

If you don’t know what a Tilt Shift lens is:

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.

And the verdict is a good one, these lenses are usually built very well.

The Canon TS-E 90mm f/2.8 is an interesting lens for those seeking the maximum of perspective and depth-of-field control - at a price of around ~1250 US$/€. Technically the lens is about as good as it gets including excellent resolution, absent CAs and zero distortions. When choosing neutral TS settings the lens shows only marginal vignetting at f/2.8 but the more you push the TS feature to the max the problem increases accordingly (1.5EV at the most extreme setting). The build quality is exceptionally high. A drawback by design is the lack of an AF motor so you’ve to rely on your manual focusing skills here.

Check it out!