 It also is the first Olympus DSLR to include in-body image stabilization; most subsequent E-system cameras include an IS system.The E-510 body and lens mount conform to the "Four Thirds System" standard, providing compatibility with other lenses for that system.Four-Thirds is a digital SLR standard using a crop factor of 2x; this means that Four-Thirds lenses can be made smaller and cheaper, but that the cameras exhibit somewhat worse high ISO performance.