Hello Mohamed-Azmey,
Noise may appear when Canon Log is [ON] and [Peripheral illumin] is enabled. Let's check to see if that is the case here. Noise may become more noticeable if you enhance the contrast when color-grading your movies. With Canon Log, skies, white walls, and similar subjects may be affected by noise or uneven gradation, exposure, or colors. Horizontal banding is more likely to occur when recording somewhat dark, flat subjects. This image noise may even occur at relatively low ISO speeds around ISO 800. Try recording under brighter conditions and adjusting brightness in color grading. Although dynamic range is narrower at ISO speeds lower than ISO 800, noise can also be reduced by recording this way.
