Product
Name：80mm Blue Film
Specifications：
Product Specifications:
Aperture: 80mm (Effective aperture: 80mm, Actual outer diameter: 83mm)
Focal Length: 400mm, 500mm, 600mm, 800mm, 900mm
Coating: Doublet with single-layer blue coating, Doublet with full-surface multi-layer broadband green coating, includes dedicated doublet spacer ring.