Related Clues:
- Thing on the cover of 'Dark Side of the Moon'
- Spectrum-forming solid
- Direct, in Hollywood slang
- Shutterbug's attachment
- Smartphone component
- Camera's focusing device
- Periscope piece
- Word with "contact" or "concave"
- Spectrum-showing device
- "Telephoto" or "contact" ender
- Peephole feature, often
- Color-full device?
- Telephoto, for one
- Microscope must
- Optics device