 Other improvements over the previous design include a built-in, pop-up flash, FAT32 support for larger-capacity CompactFlash storage cards, a higher continuous shooting speed of 3 frames per second, an upgraded auto focus system with 5 sensors, an AF assist lamp, an improved viewfinder with a 0.9 × magnification, an almost silent and more durable shutter rated at 100,000 actuations, a larger 2.5" LCD monitor, a USB 2.0 interface (but no firewire interface anymore), and a proprietary rechargeable (Minolta NP-400 compatible) lithium ion battery system with a claimed 500 shot capacity (user experience puts it closer to 150-200).Sigma also states that the re-design of the shutter has eliminated the problem of particles flaking off of that mechanism and onto the sensor.Sigma has also revised the infrared filter (dust protector); it is now a round snap-in design rather than the square, sturdier screw-in version of the SD10.