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 set of filters covers a wide spectral range from 401nm to the sensitivity limit of silicon CCD cameras (~1100nm). Each filter is optimized for maximum transmission and superior contrast, thanks to exceptional OD5 density optical suppression.

Key features

• Ion gun assisted deposition coating on double-sided polished substrate
• Full-spectrum suppression of light leakage with OD5
• Optimized separation between g’ and r’ filters to avoid atmospheric glow line at 558nm
• Wide transmission windows enable measurement of weaker 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
• Observation of weak targets with reduced exposure time
• Scientific imaging requiring precise spectral separation

Technical specifications

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

Important note

• Due to the poor quantum efficiency of ultraviolet sensors, Antlia does not produce the u’ filter (300-400nm).