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To achieve various features requires different design tradeoffs and thus the different types of Nagler eyepieces
ZWO FF131 APO Flat-Field Apochromatic Refractor
5 Height Range (ft) 3
75 pitch) threads
ZWO 7-Position EFW (7x2") 2025 Like New To achieve various features requiresThe Next Generation ZWO EFW Refined Design Anti Light Leak Protection Built for Astrophotography A re engineered internal design helps reduce light leakage, while the refined mechanics deliver smoother, more consistent rotation. The exterior has been subtly streamlined, giving the wheel a cleaner and more cohesive look. Nothing dramatic. Just better in the ways that matter so your imaging workflow stays steady, reliable, and quietly improved. The ZWO
