Canon L lens

[1] Some models of L lenses utilize an infrared reflective heat shield coating.

Their front elements do not rotate for the proper operation of some filters, such as circular polarizers.

All current L-series lenses have ultrasonic autofocus motors (USM) with an exception of RF 10–20mm f/4 L IS STM lens, and extra communication pins, except for the specialist tilt-shift lenses which do not provide auto focus.

Larger sized L-lenses, such as the 70–200 mm, 100–400 mm zooms, and longer focal length primes (300 mm+), usually have an off-white barrel to reduce heat absorption under the sun that may otherwise affect the performance of the lens.

[1]The Canon PowerShot Pro1 is the first in the Canon PowerShot family of point-and-shoot cameras to have an L-designated zoom lens ranging from 7.2 to 50.8 mm, equal to 28 to 200 mm in 35mm equivalent focal length.