Photometric filters Antlia SLOAN (g'r'i'z') - 4 pieces

Antlia Photometric Sloan filters

Antlia Photometric Sloan filters are designed for high-precision photometric imaging, based on the Sloan Digital Sky Survey (SDSS) photometric system. This filter set covers a wide spectral range from 401 nm to the sensitivity limit of silicon CCD cameras (~1100 nm). Each filter is optimized to provide maximum transmission and superior contrast, thanks to exceptional OD5 optical density suppression.

Key features

• Ion gun assisted deposition coating on double-sided polished substrate
• Full-spectrum suppression of light leakage with OD5
• Optimized separation between the g’ and r’ filters to avoid the atmospheric glow line at 558 nm
• Wide transmission windows that allow for the measurement of smaller objects in less time
• Compatible with optical systems from f/15 to f/1.8
• Maximum transmission greater than 98% (g’ greater than 95%)
• Standardized filter thicknesses for consistent fragrance
• Each filter is individually coated (not cut from a plate)

Application and performance

• Professional astronomical photometry
• Observing Faint Targets with a Short Exposure Time
• Scientific imaging requiring precise spectral separation

Technical specifications

• g’: 401–550 nm, transmission 95%, suppression ≥ OD5
• ’r": 562–695 nm, 98% transmission, suppression ≥ OD5
• ’i": 695–844 nm, transmission 98%, extinction ≥OD5
• z’: >820 nm, 98% transmission, suppression ≥OD5
• Thickness: 3mm ± 0.05mm (D50mm format)
• Optical surface: λ/4 before coating

Important note

• Due to the poor quantum efficiency of sensors in the ultraviolet spectrum, Antlia does not manufacture the u’ filter (300–400 nm).