Lensbaby's Simple Single Glass optic is similar to the primitive optic you would find in an antique camera. Single Glass is ideal for fine art, portraiture, black and white images, and any shot requiring a subtle, soft, dreamy effect. Part of the Lensbaby Optic Swap System.Use the Optic Swap Tool to pop out your optic and drop a new optic into your Lensbaby lens. To change your aperture, simply touch the tip of your Magnetic Aperture Removal Tool to the aperture disk and lift it out. Then drop a new aperture disk into the front of the lens.Compatible with the Composer, Muse, and Control Freak.