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