Canon EOS Rebel T6i EF-S 18-55mm IS STM Lens Kit Instruction Manual - Page 373

Troubleshooting Guide The continuous shooting speed is slow.  Depending on the lens type, shutter speed, aperture, subject conditions, brightness, etc., the continuous shooting speed may become slower.  If [z3: Anti-flicker shoot.] is set to [Enable] and you shoot under a flickering light source, the continuous shooting speed may become slightly slower, or the continuous shooting interval may become irregular. Also, the time lag until shutter release may be slightly longer than usual (p.144).  If you set [Distortion] to [Enable], the continuous shooting speed will decrease (p.141). The maximum burst during continuous shooting is lower.  If you shoot something that has fine detail such as a field of grass, the file size will be larger, and the actual maximum burst may be lower than the number mentioned on page 117. ISO 100 cannot be set.  Under [54: Custom Functions (C.Fn)], if [3: Highlight tone priority] is set to [1: Enable], ISO 100 cannot be set. If [0: Disable] is set, ISO 100 can be set (p.339). This also applies to movie shooting (p.226). ISO speed [H] (equivalent to ISO 25600) cannot be set.  Under [54: Custom Functions (C.Fn)], if [3: Highlight tone priority] is set to [1: Enable], the [H] ISO speed (equivalent to ISO 25600) cannot be selected even when [2: ISO expansion] is set to [1: On]. If [0: Disable] is set for [3: Highlight tone priority], [H] can be set (p.339). The Auto Lighting Optimizer cannot be set.  Under [54: Custom Functions (C.Fn)], if [3: Highlight tone priority] is set to [1: Enable], the Auto Lighting Optimizer cannot be set. If [0: Disable] is set, the Auto Lighting Optimizer can be set (p.339). 373