The University series filtering system is designed for serious research programs requiring full aperture spectral uniformity. Systems are fabricated from the finest optical and filtering components available. Full aperture 32 mm.
Lower values correspond to narrower bandwidth filters.
The peak wavelength of any 12 mm. The ATM series filter system is designed to meet the needs of most amateur solar observers. Lower values correspond to narrower bandwidth filters. Average optical density grater than 6.0 from X-ray to beyond 2.0 microns . The T-Scanner series filter system is designed for visual observers requiring effective filtration without access to AC power.