wire-frame viewfinder
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- time-averaged shadow-moire method
- multilongitudianl-mode laser
- Varotal lens
- optical deformation
- visible emissivity
- mode pattern
- upper state relaxation
- frequency summing
- optical harmonic generation
- optical head controllers,control ics/modules
- diatomic roto
- intensifying screen
- push out
- filters
- holographic gratings
- astrospectrograph camera
- metacrystalline
- chronophotography
- geometrical focus
- infra-red beam folower