Canon EOS Rebel T6i EF-S 18-55mm IS STM Lens Kit Instruction Manual - Page 372
I cannot lock the focus and recompose the shot., Horizontal stripes appear
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Troubleshooting Guide I cannot lock the focus and recompose the shot. Set the AF operation to One-Shot AF. Focus lock is not possible in the AI Servo AF mode, or when servo takes effect in AI Focus AF mode (p.100). Linear noise or moire appears in the image. Depending on the subject, linear noise or moire may be recorded in the image. It is likely to occur especially in the following cases. • Shooting fine horizontal stripes, lattice patterns, etc. • When there is an intense light source such as sunlight or lighting in or near the shooting range. In such a case, noise and moire may be reduced by the following measures. • Change the size of the subject by changing the focusing distance or zoom magnification. • Recompose the shot to prevent an intense light source from entering the shooting range. • Attach the lens hood to prevent intense light from entering the lens. If you use a TS-E lens and shift or tilt, linear noise or moire may be recorded in the image. Horizontal stripes appear, or the exposure or color tone look strange. Horizontal stripes (noise) or irregular exposures can be caused by fluorescent lighting, LED lighting, or other light sources during viewfinder or Live View shooting. Also, the exposure or color tone may not come out right. A slow shutter speed may solve the problem. 372