The Canon WD-H58W 0.8x Wide angle converter lens was designed primarily for the Canon for XA10 Professional AVCHD Camcorder, but as it has a 58mm thread, it can also be used equally well with the Canon XF100 and XF105 Solid State Professional Camcorders. When attached to the XA10's 30.4mm lens, it will convert it to 24mm, which is ideal when working in small rooms or with wide horizons.