 "Canon telephoto zoom lens" " Canon lens - 6473A003 Camera & Camcorder Lenses CDW.com
"Developed to succeed the EF75-300mm f/4-5.6 II, this compact, lightweight high-magnification telephoto zoom lens covers medium telephoto 75 mm to super telephoto 300mm. Like the EF75-300mm f/4-5.6 III USM, it has a metal ring at the front of the zoom ring to give it an upscale image. It uses a DC motor as AF drive actuator. For environmental protection, only lead-free glass lens elements are used." 
 "Sigma 70-300mm f/4-5.6 DG OS Telephoto Zoom for Pentax AF Digital SLR Cameras"@en Cameras - Fumfie.com"@en