Replaces the Lensbaby 2.0. Compatible with Pentax K / Samsung GX Cameras.With the Composer, Lensbaby introduces a completely new lens, based on a ball and socket configuration that delivers smooth selective focus photography with unparalleled ease. Photographers simply tilt the lens to a desired angle and then focus with a manual focusing ring. The Composer stays in the desired bent position without requiring a locking mechanism and features the new Lensbaby Optic Swap System.How to UseThe Composer is a breeze to use. Simply bend the lens to move the Sweet Spot and then focus.The Composer stays in its bent position without needing to be locked. If you want to ensure the Composer will not move during an extended shooting session, you can lock the lens's position by rotating the Locking Ring. This locking feature makes the Composer ideal for studio photography or for longer or repeated exposures.Note: No electronic communication between the lens and the camera body. Automatic light metering is possible by shooting in aperture priority mode for almost all digital and film SLR camera bodies except certain Nikon bodies including the D40, D50, D60, D70, D70S, D80, D90, D100, N50, N65, N70, N75, N80, Kodak 14N and ProN, & Fuji S1, S2, and S3.