The EF 300mm f/4L IS USM is controlled by a 16-bit microcomputer that minimizes blurred images due to camera shake. A special mode intelligently compensates just for up & down movement, providing sharp, stable images for panning. The optical design that compensates for all types of aberrations from infinity to the closest shooting distance of 4.9'. Two ultra-low dispersion (UD) glass elements ensure clear images and accurate color. Image Stabilization technology gives you the equivalent effect of up to 2 full shutter speeds slower handholdability than a conventional lens. And Canon's advanced ultrasonic focusing motor (USM) and rear focusing design provide silent, high speed autofocusing with fulltime manual focus override.
• Compact L-series Telephoto lens with Image Stabilizer • UD elements eliminate secondary spectrum chromatic aberration • Two-stage image stabilization; dual-axis camera shake correction or vertical axis only (for panning) • Full-time manual focus override on lens
Filter Size 77mm f/Stop Range 4-32 Minimum Focus Distance 4.9' Magnification 1:4.2 Zoom/Focus Control Not applicable Angle of View 8 Degrees Groups/Elements 11/15 Tripod Collar Yes Length 8.7" Maximum Diameter 3.5" Weight 2.60 lb
Rey, the Mastah has given his verdict! I just hope it focuses well with my other lenses, coz I already sold this lens to Telyds (who seems to be enjoying its performance very much)
Sorry to burst your bubble Bong but the 1D3 is known to have focusing issues with longer lenses starting with focal lenghts of 500mm and longer but because I'm your friend I'm still willing to take this camera so you will not have a problem with your newly acquired 500 F4. I will just downgrade to my favorite 400 5.6 BIF lens. ;D