Canon addressed the ‘feedback loop’ in later model IS lenses by introducing an algorithm to the IS detection system to automatically recognise when the lens is mounted to a tripod. When these lenses are mounted on a tripod and the shutter button is pressed halfway, the IS system kicks in and the image in the viewfinder can be seen to go through a very slow vertical shift for about one second.
If the shutter button remains depressed halfway the IS system detects the lack of motion and automatically switches into a special mode. In this mode IS detects and corrects for mirror slap and shutter movement at slow speeds, but not for ‘normal’ lens shake. There is no advantage to be gained in turning off the IS function or locking the mirror prior to exposure.
The early model lenses which do not have this automatic function and which should have IS turned off (ie lock the IS correction lens group in place) when mounted on a tripod include the following lenses:
EF28-135mm f/3.5-5.6 IS USM EF75-300mm f/4-5.6 IS USM EF100-400mm f/4.5-5.6L IS USM EF300mm f/4L IS USM 顺便也说一下，用gimbal head拍鸟的时候，一般跟拍比较多，可以尝试一下佳能镜头的Mode 2防抖模式。 The trouble with panning
The stabilisation characteristics of the IS system are most effective when shooting stationary subjects. When panning a moving subject is attempted the IS system attempts to correct the movement, the act of which can detract from rather than enhance a photograph. To resolve this problem Canon developed Image Stabilizer Mode 2.
Mode 2
When shooting in this mode, if a major movement in a particular direction continues for a certain time, the Image Stabilizer system determines that this movement is conscious panning, rather than camera shake. Correction in the relevant direction halts, while correction perpendicular to the panning direction continues. In other words, the system detects panning operation and executes the appropriate control suitable for panning, resulting in a sharper image of the subject being panned. First seen on the EF300mm f/4L IS USM Mode 2 is now seen on other Canon lenses, mainly telephotos and telezooms.
http://cpn.canon-europe.com/content/education/technical/image_stabilization_lenses.do?page=2
Canon addressed the ‘feedback loop’ in later model IS lenses by introducing an algorithm to the IS detection system to automatically recognise when the lens is mounted to a tripod. When these lenses are mounted on a tripod and the shutter button is pressed halfway, the IS system kicks in and the image in the viewfinder can be seen to go through a very slow vertical shift for about one second.
If the shutter button remains depressed halfway the IS system detects the lack of motion and automatically switches into a special mode. In this mode IS detects and corrects for mirror slap and shutter movement at slow speeds, but not for ‘normal’ lens shake. There is no advantage to be gained in turning off the IS function or locking the mirror prior to exposure.
The early model lenses which do not have this automatic function and which should have IS turned off (ie lock the IS correction lens group in place) when mounted on a tripod include the following lenses:
EF28-135mm f/3.5-5.6 IS USM EF75-300mm f/4-5.6 IS USM EF100-400mm f/4.5-5.6L IS USM EF300mm f/4L IS USM 顺便也说一下，用gimbal head拍鸟的时候，一般跟拍比较多，可以尝试一下佳能镜头的Mode 2防抖模式。 The trouble with panningThe stabilisation characteristics of the IS system are most effective when shooting stationary subjects. When panning a moving subject is attempted the IS system attempts to correct the movement, the act of which can detract from rather than enhance a photograph. To resolve this problem Canon developed Image Stabilizer Mode 2.
Mode 2When shooting in this mode, if a major movement in a particular direction continues for a certain time, the Image Stabilizer system determines that this movement is conscious panning, rather than camera shake. Correction in the relevant direction halts, while correction perpendicular to the panning direction continues. In other words, the system detects panning operation and executes the appropriate control suitable for panning, resulting in a sharper image of the subject being panned. First seen on the EF300mm f/4L IS USM Mode 2 is now seen on other Canon lenses, mainly telephotos and telezooms.
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