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