Compatible with Pentax K / Samsung GX Cameras.The Control Freak is the evolution of the Lensbaby 3G, an ideal selective focus lens for tabletop and macro photography. You can compress and bend the lens to find your desired Sweet Spot, and then lock it in place with the push of a button. Once locked, you can fine focus using the barrel focusing ring and fine tune the tilt with the Control Freak's three metal posts.How to UseFocus your Control Freak by compressing the lens with your fingers until your subject comes into focus. Then you can move the Sweet Spot around the photo by bending the lens.When the Sweet Spot is sharp and placed where you want, press the Locking Button on the Focusing Collar to lock your Lensbaby 3G into place. You can then adjust your focus by rotating the Fine Focusing Ring, much like a manual focus lens. You can also fine tune your tilt by rotating the metal rods.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.