Antlia Photometric Sloan Filters fi = 50 mm all astro filters opinie

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Antlia Photometric Sloan Filter Set 50 mm (griz’) is a professional set of photometric filters designed for the Sloan Digital Sky Survey (SDSS) system. The set includes four filters (g’, r’, i’, z’) covering the spectral range from 400 nm up to the sensitivity limit of silicon CCD sensors (~1100 nm). The filters are manufactured using Ion Beam Assisted Deposition coating technology on double-side polished substrates, ensuring high consistency, durability and optical accuracy.

Key features

• Sloan (SDSS) photometric filter set: g’, r’, i’, z’
• spectral coverage from 400 nm to approx. 1100 nm (CCD sensitivity limit)
• high peak transmission up to 98% (g’ > 95%)
• excellent out-of-band blocking (≥ OD5)
• wide transmission windows allowing faster measurement of faint objects
• compatible with optical systems from f/15 to f/1.8
• identical filter thickness ensuring parfocality
• each filter individually coated (not cut from a larger coated plate)
• substrate quality of 1/4-wave prior to coating
• Ion Beam Assisted Deposition (IBAD) coating technology

Box contents

• g’ filter 50 mm (unmounted)
• r’ filter 50 mm (unmounted)
• i’ filter 50 mm (unmounted)
• z’ filter 50 mm (unmounted)

Technical specifications

• manufacturer: Antlia
• type: Sloan (SDSS) photometric filters
• size: 50 mm (unmounted)
• number of filters: 4
• g’ filter: 400–550 nm, transmission > 95%, blocking ≥ OD5
• r’ filter: 555–705 nm, transmission 98%, blocking ≥ OD5
• i’ filter: 688–850 nm, transmission 98%, blocking ≥ OD5
• z’ filter: > 812 nm, transmission 98%, blocking ≥ OD5
• filter thickness: 3 mm ±0.05 mm
• operating range: f/15 to f/1.8
• coating technology: Ion Beam Assisted Deposition
• surface quality: 1/4-wave (before coating)