Related Clues:

• Slide projector part
• Word with contact or zoom
• See 22-Down
• Bifocal, e.g.
• Telescope part
• Part of S.L.R.
• Where rods and cones are
• Refraction producer
• Cinematographer's concern
• Telescope piece
• Microscope part
• Contact, e.g.
• Eyeglass parts
• It may zoom
• It's sensitive to light