Telescopic
Interfaces
Outdoor sports equipment
Optical properties of materials
Seatings
Weapons
Dimensional tolerances
Classification systems
Tolerances (measurement)
Optics
Visual perception
Optical instruments
Tolerances of position
Telescopes
Small arms
Performance
Link: BS ISO 21575:2018 Optics and photonics. Optical materials and components. The powder test method for the water resistance of optical glass
Source: BSI Standards
