Canon EF 24-70mm f-2.8L II USM Lens

The Canon EF 24-70mm f/2.8L II USM is
a professional, constant f/2.8 L-series standard zoom lens, prized for its exceptional image quality, fast performance, and robust, weather-sealed build, making it a versatile “workhorse” for weddings, events, and general professional shooting, featuring advanced optical design (UD/Aspherical elements) for sharpness, Ring-USM autofocus, a 9-blade aperture for nice bokeh, fluorine coatings, and a zoom lock for durability, compatible with full-frame and APS-C DSLRs.
Key Features:

Focal Length & Aperture: Versatile 24-70mm range with a fast, constant f/2.8 maximum aperture, excellent for low light and depth of field control.
Optical Quality: Advanced design with Super UD, UD, and Aspherical elements to minimize aberrations, plus Super Spectra coatings to reduce flare and ghosting.
Autofocus: Ring-type Ultrasonic Motor (USM) for fast, quiet AF, with full-time manual focus override.
Build & Handling: L-series professional construction, dust/moisture resistant, fluorine coating on front/rear elements, smooth zoom/focus rings, zoom lock switch.
Aperture Blades: 9-blade circular diaphragm for smooth, attractive background blur (bokeh).
Compatibility: Works with full-frame (EF mount) and APS-C Canon DSLRs.
Filters: Uses 82mm filters.

Who It’s For:

Professionals: Wedding, event, portrait, and travel photographers needing reliable, high-quality results.
Enthusiasts: Those seeking a versatile, high-performance standard zoom to cover wide-angle to short telephoto needs.

What Makes It Stand Out:

Constant f/2.8: Maintain exposure and depth of field without stopping down.
Optical Excellence: Delivers sharp images with great color accuracy across the frame.
Durability: Built to withstand professional use in challenging environments.
Improved Design (vs. Version I): Lighter, more compact, better coatings, and smoother rings, notes Digital Photography Review