A classic with excellent imaging performance. This lens telephoto lens is quite handy and lightweight despite its length of about 300 mm. The design, which uses only 5 lenses in 4 groups, allows for outstanding, color-accurate, and sharp images without disturbing field curvature. The relative aperture of 1:8.0 enables outdoor use, even in wildlife photography or detail photography in landscapes. The preset aperture feature allows you to set the desired aperture in advance; this can then be adjusted from the largest opening to the preset value with a quick turn of the finger. Advantage: maximum viewfinder brightness when focusing, and lightning-fast switching to the preset aperture for photography or filming. The attached 360° rotating tripod mount allows for balanced attachment to a tripod and switching between portrait and landscape format. On most cameras, the lens operates in shutter priority or manual mode. For more details, refer to your camera's manual. T2 connection, operating tip: The T2 adapter is screwed onto the lens, and then the lens is locked in place. The side screws on the T2 adapter allow for "uprighting" the lens after loosening them - aligning the index for infinity or the depth of field marks upwards. Retightening the screws securely holds the lens and adapter. Save time in post-processing. Many lens errors such as distortion, edge softness, or vignetting occur at the outer areas of the image. When using a lens designed for full-frame on a camera with an APS-C sensor, these areas are not utilized. This way, you achieve maximum quality. Additional post-processing time for correcting lens errors is thus eliminated.