Related Clues:

• See 22-Down
• Bifocal, e.g.
• Telescope part
• Crosshair setting
• Part of S.L.R.
• Refraction producer
• Cinematographer's concern
• Telescope piece
• Microscope part
• Contact, e.g.
• Eyeglass parts
• It may zoom
• World view
• Telephoto or contact
• Optometrist's concern