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Canon 35mm Lenses
The Canon TS-E 90mm f/2.8 Tilt-Shift Lens is a very sharp lens with excellent contrast/saturation. The TS-E 90 is very sharp wide open - among the sharpest of Canon's lenses. Corner sharpness is very good even wide open. Full shift decreases sharpness (and creates autoexposure issues). The Canon TS-E 90mm f/2.8 Tilt-Shift Lens is slightly-moderately sharper than the Canon TS-E 45mm f/2.8 Tilt Shift-Lens, especially wide open in the corners on a full frame body.
The Canon TS-E 90mm f/2.8 Tilt-Shift Lens has nearly no light fall-off even wide open (f/2.8) unless shifted to near limits on a full frame body. CA is very well controlled on my first copy of this lens - better than the other TS-E lenses, but my second copy does exhibit a small amount wide open. Flare-resistance is high - flare only shows up with the sun actually in the picture (or similar extreme circumstances). Distortion is very well controlled.