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photo:focus [2017/10/31 12:38]
gary1 [digital cameras and focus]
photo:focus [2019/07/21 01:49] (current)
gary1 [Introduction:]
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     * low light: ​     * low light: ​
       * the lower the light level, the longer it takes for most AF mechanisms to focus & thus the longer the image must be kept still in the viewfinder before a lock is obtained. Moving the camera or having a subject who moves will often result in failure of focus lock.        * the lower the light level, the longer it takes for most AF mechanisms to focus & thus the longer the image must be kept still in the viewfinder before a lock is obtained. Moving the camera or having a subject who moves will often result in failure of focus lock. 
-      * many cameras have a low light AF illuminator to assist but these usually only work for up to 2m or so+      * many cameras ​or external flashes ​have a low light AF illuminator to assist but these usually only work for up to 2m or so, and **if the AF Illuminator is infrared, it will not work well with mirrorless cameras as their AF sensors sit behind the sensor'​s IR blocking filter**
     * moving subject: ​     * moving subject: ​
       * a moving subject is difficult for most AF mechanisms, although high-end cameras often have a "​predictive motion"​ AF mode (eg. Canon'​s AI Servo mode) that helps with this.        * a moving subject is difficult for most AF mechanisms, although high-end cameras often have a "​predictive motion"​ AF mode (eg. Canon'​s AI Servo mode) that helps with this. 
photo/focus.txt ยท Last modified: 2019/07/21 01:49 by gary1