An image capture apparatus including a detecting unit configured to detect focus detecting system dust, and a controller configured to perform control so that captured image information is stored in a memory, wherein the controller performs control so that information about the detected focus detecting system dust is stored in the memory. At its upper end it is cut away so that slurry flow can exit ports in a hardened sleeve and impinge directly onto the upstream portion of the insert. Each microcomputer is applied with an identification signal indicative of a main one or sub one. The user performance characteristics may include speed, cadence, time energy cost, distance energy cost and acceleration energy cost. These techniques include support of initialization and batching of updates, use of updates and lookaside lists, use of gutters, blending and BLT operations, surface optimization techniques such as push down as well as enumeration and clumping, mesh usage, and occlusion management techniques.