When shooting with AF, the Full-time Manual Focus override allows you to instantly make fine focusing adjustments manually, without having to switch between modes.
Go to TAMRON TAP-in Console Online Help This design philosophy in pursuit of functional beauty with a “Human Touch” is applied even to minute details for the SP 150-600mm G2 ultra-telephoto lens as well.Photographers can shoot from any angle without the zoom extending unintentionally.Additionally, the customary Zoom Lock switch prevents unwanted barrel extension during transportation.Those SP models feature a novel design for the switches, easy-to-read characters, an enlarged window over the distance scale, and the adoption of organic forms easy for the photographer’s fingers to hold onto. ** Weight includes the weight of detachable tripod mount.*** The circular diaphragm stays almost perfectly circular up to two stops down from maximum aperture. MTF (Modulation Transfer Function) curves describe to what extent the tested lens can faithfully reproduce contrast of the subject in images it captures.