Canon EF 17-40mm f/4L Usm

The Canon EF 17-40mm f/4L USM is the latest ultra-wide angle zoom lens that is suited for film and digital SLRs. It offers exceptional optical quality due to the use of a three lens element. The lens also sports a Super Ultra-low Dispersion (UD) glass and optical coatings to ensure that chromatic aberrations, glare and distortion can be minimized.

The build of the Canon EF 17-40mm f/4L USM Lens is of the highest quality you'll find. Yet, Canon has found a way to keep the price tag relatively affordable. No wonder that this lens is one of Canon's best selling ultra wide angle zoom lenses. Though it feels solid, the Canon EF 17-40mm f/4L USM Lens is actually one of the lightest and smallest L lenses that the company has produced. It weighs 1.1 lb and measures 3.3" x 3.8". Similar to other top of the line L-series lenses, this particular lens is also weather resistant. Note that you will need a UV filter to complete the weather sealing.

The lens has a focus as close as 11". Powered by a Ring Ultrasonic Motor (USM), it can autofocus extremely fast, accurately and almost silently. For those who seek more challenges, Canon also offers Full Time Manual focusing as well.

The Canon EF 17-40mm f/4L USM make a great wide landscape photography lens. Coupled with its affordable price, this is one attractive lens that you should not miss out.

• Elements/groups: 12/9
• Diagonal angle of view: 104°-57° 30'
• Focus: Inner focusing with USM
• Closest focus:0.9ft
• Filter: 77mm