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