The Lensbaby Optic Kit includes three optics options: Plastic, Pinhole / Zone plate, and Single Glass. These three optics are only available as part of the Optic Kit.

Plastic Optic - our softest optic overall and it creates very ethereal photos with abundant chromatic aberration. 
Pinhole/Zone plate Optic - lets you shift easily back and forth from pinhole to zone plate mode by simply sliding a toggle inside the optic. In pinhole or zone plate mode, this optic insert achieves soft focus and dreamy images that are equally sharp from edge to edge.
Single Glass Optic - is an update of the Original Lensbaby optic, ideal for fine art, portraiture, black and white images, and any shot requiring a subtle, soft, dreamy effect.

Specs

Pinhole / Zone plate

• Pinhole: 50mm focal length / Zone plate 50mm focal length  
• Pinhole: f/177 / Zone plate f/19 
• Ships with clear plastic storage case and removal tool
• 1.75" (4.44 cm) x 1.37" (3.5 cm) 
• Compatible with the Composer, Composer Pro, Muse, Control Freak, Scout and Spark

Plastic

• 50 mm focal length 
• Uncoated double convex plastic singlet 
• Ships with clear plastic storage case and removal tool 
• 1.75" (4.44 cm) x 1.37" (3.5 cm) 
• Compatible with the Composer, Composer Pro, Muse, Control Freak, Scout and Spark

Single Glass

• 50 mm focal length 
• Uncoated double convex optical glass singlet 
• Ships with clear plastic storage case and removal tool 
• 1.75" (4.44 cm) x 1.37" (3.5 cm) 
• Compatible with the Composer, Composer Pro, Muse, Control Freak, Scout and Spark