The Tokina 17-35mm f/4 Pro FX Lens is specifically crafted for Canon full-frame digital and film cameras. This ultra wide-angle lens offers an impressive 103.9° field of view at the 17mm focal length, along with a consistent f/4.0 maximum aperture, which is particularly advantageous for photography in low-light environments. The incorporation of two Super-Low Dispersion glass elements and one aspheric glass element enhances contrast and sharpness while effectively minimizing chromatic aberration.

Additionally, Tokina's One-Touch Focus Clutch Mechanism allows for a seamless transition between autofocus and manual focus modes. The lens is constructed with enhanced seals, rendering it "water-resistant" (though not waterproof), ensuring that light moisture does not hinder your photographic endeavors. Furthermore, it features a water-repellant optical coating, but it is important to note that it should not be submerged in water or subjected to heavy rainfall.

• Designed for full-frame cameras, the Tokina AT-X 17-35mm F/4 give photographers a new wide-angle option. With a focal length of 17mm at the wide side the lens yields a spectacular 103.9 degree field of view which is great for shooting in tight situations or for taking in wide expanses of space.
  
  
• This compact wide-angle zoom has a bright constant F/4 aperture make viewing and auto focus possible in lower light situations but still maintaining a reasonable size and weight.
  
  
• Two Super-Low Dispersion glass elements and one aspheric glass allow the proprietary optical design to achieve excellent contrast and sharpness as well as controlling chromatic aberration.
  
  
• Tokina's exclusive One-touch Focus Clutch Mechanism allows the photographer to switch between AF and MF simply by snapping the focus ring forward for AF and back toward the lens mount for manual focusing.
  
  
• The mechanics have been designed for better seals around moving parts making the lens more water-resistant than lenses of the past. It has a water-repellant optical coating, but is not safe to submerge in water or expose to heavy rain. The lens is also designed to stand up to the rigors of daily use by photographers in a wide variety of shooting conditions and environments.