The EF 100mm F2 USM is a short telephoto lens with a wide aperture, making it ideal for portraits. The lens compresses facial features and ensures the subject stands out against a blurred backdrop. Long focal length and compact size The EF 100mm F2 USM has a large maximum aperture, but is still relatively compact. The 100mm focal length lets photographers maintain a comfortable working distance from their subjects, and also helps to compress perspective. Sharp, crisp pictures are obtained at all apertures throughout the range. Large F2 aperture A large maximum aperture of F2 provides outstanding speed for low-light shooting, without the need for flash. Shooting at such wide apertures also throws the background out of focus, placing more emphasis on the subject. Smooth background blur A virtually circular aperture diaphragm gives out of focus regions a softer, more uniform feel. Sharp foreground objects stand out against a smooth blurred background. Ultrasonic focusing A ring-type ultrasonic motor drives autofocus extremely quickly, and in near silence. Excellent holding torque ensures the point of focus is reached accurately, without overshooting. Furthermore, full-time manual override is available, making it possible to adjust focus without leaving AF mode. Super Spectra coating Super Spectra coatings ensure accurate colour balance and enhance contrast. They also reduce flare and ghosting - a common problem caused by light bouncing off a cameras sensor. Integration with E-TTL II flash metering The lens passes distance information back to a compatible EOS cameras E-TTL II flash system to ensure optimal flash metering. Medium telephoto lens Fast F2 aperture USM focus motor with full-time manual focus 90cm closest focusing distance 58mm filter size Super Spectra coatings reduce ghosting and flare EF Mount Lens Aperture Range: F2-22 Internal Focusing System Ultrasonic Focus Motor Minimum Focus Distance: 2.95... More