This adapter allows standard 2/3-inch television lenses to be used with 1/3-inch bayonet mount cameras such as the JVC GY-HD100. Image magnification will occur. The AC-M17 2/3-inch lens adapter for 1/3-inch HDV camcorders. Allows the use of Sony B4 mount 2/3-inch HD lenses on the 1/3-inch HDV camcorders.