ISO settings must be low to use a large aperture in bright lighting conditions. When light conditions require low ISO settings, saturation of the image pickup device is a concern. Blowout is often the result in digital cameras. But due to abundant charge storage, the Canon CMOS sensor is less likely to become oversaturated or produce blowout — even under bright light shooting. Now you can create appealing background blurs with a combination of low ISO setting and a large-diameter EF lens.