This lens is of a conventional design and was introduced in 2005, to offer an increase in performance from the earlier 75-300mm lenses in the Canon EF lens lineup. Like the 70–300mm f/4.5–5.6 DO it contains an image stabilizer; however, for focusing it uses the lower quality micro-USM design, and therefore requires the focus motor to be disengaged before manual focusing. Canon 70-300 DO IS USM Repair Manual - Canon Ef 70-300 Mm F/4.5-5.6 Do Is question.
With the introduction of the Canon EF 70-300mm f/4-5. Metro A Responsive Theme For Phpbb 3 Skins. 6 IS USM Lens, Canon has replaced one of its most popular lenses and its first image stabilized lens - the. The 75-300mm IS lens was popular because of its useful focal length range, small size, light weight, midrange price and Image Stabilization. The 70-300 IS improves this overall package (sacrificing only price somewhat). Download Free Step Up To Medicine Errata Pdf Printer. Sporting a 3rd generation image stabilizer, the Canon EF 70-300mm f/4-5.6 IS USM Lens is designed to be handholdable at a shutter speed up to 3 f-stops slower than a non-stabilized lens at the same focal length. 'Gyro sensors detect unwanted vibrations, triggering the corresponding movement of a correcting lens group perpendicular to the optical axis.
This alters the light path, returning the image to its correct position on the sensor or film plane.' [Canon] Using the 1/(focal length) rule, this lens can be handheld at 300mm with a shutter speed of 1/45 of a second (of course, your mileage may vary). I am getting sharp handheld images consistently at 1/4 or 1/5 second shutter speeds at 70mm and at 1/25 second at 300mm on a full frame body. All of the 70-300 IS sample pictures (link below) were taken handheld. Automatic tripod sensing prevents '. Feedback loops between the IS sensor and stabilizer motor vibrations' [Canon]. This implementation of IS includes Mode 1 and 2 stabilization.
