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