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Canon EF 135mm f/2.0L Lens

Canon EF 135mm f/2.0 L

Canon EF 135mm f/2.0L lens fitted to an EOS 5DII body.

Specification (in order of importance to me)

Focal length: 135mm
Maximum aperture: f/2.0
Weight: 750g
Closest focusing distance: 900mm
Filter thread: 72mm
Focusing: auto/manual

Arguably one of Canon's sharpest lenses, although due to it's weight, it rarely goes in my backpack.  It does leave the house though, when shooting at normal elevations which don't involve much in the way of uphill hiking.

Like the 85mm f/1.2L, the large maximum aperture is useful for isolating subjects from their surroundings thanks to the shallow depth of field available at f/2, which can create a very soft, out of focus background.  This attribute makes it very popular for portraiture, which includes wildlife portraits.

For distant scenes, this focal length can be used to great effect for making stitched panoramas, where several overlapping shots are taken & later stitched together in software, creating a very high resolution image with excellent detail.  Since there is relatively little distortion, the software doesn't have much work to do aligning & correcting the individual files.