Canon EF 24-105mm f/4L IS USM is ideal for traveling photographers and photojournalists because of its Weather-Sealed Body Design, Bright f/4L maximum aperture & 24-105 mm equivalent focal length! Canon EF 24-105mm f/4L IS USM Lens possesses a bright f/4L maximum aperture that allows crisp imagery in difficult lighting conditions. Further, it provides improved control over the depth of field that facilitates subject isolation and enables working with selective focus techniques. Additionally, the constant f/4L maximum aperture allows consistent performance even in the full zoom range. Our Take on the Canon EF 24-105mm f/4L IS USM: The Super Spectra Coating suppresses flare and ghosting and renders higher contrast and color fidelity in strong lighting conditions and harsh climates. The ring-type Ultrasonic Motor (USM) outputs quick and quiet autofocus. The USM even allows full-time manual focus override. Also, Optical image stabilization reduces camera shake and results in sharper handheld shooting. The design comes with one super ultra-low dispersion and three aspherical elements that reduce chromatic and spherical aberrations and limit distortion. The rounded 8-blade diaphragm renders astounding bokeh quality images. The physical focus limiter switch allows three ranges for desired focusing speed. The lens is appropriate for full-frame Canon EF-mount DSLRs; however, it is compatible with APS-C models also. The lens provides 38.4-168mm equivalent focal length in APS-C models. Additionally, like all the L-series lenses, this lens is also dust and moisture-sealed and can withstand inclement environmental conditions. TOP 10 KEY FEATURES: Build Quality: Dust and moisture-sealed lens barrel Lens Construction: 18 Elements in 13 Groups Angle of View: 84° to 23° 20' Number of Diaphragm Blades: 8 Blades (Rounded diaphragm) Maximum Magnification: 0