Neptune Convertible Art Lens System Review

January 24, 2018 | Amy Davies | Rating star Rating star Rating star Rating star


  • Lens Focal length: 35mm, 50mm, 80mm, front lens group convertible
  • Front lens group mounting mechanism: bayonet mount
  • Aperture type: multi-scaled Diaphragm + drop in aperture plate
  • Multi-scaled diaphragm aperture: 35mm: extended and f/3.5 - f/22, 50mm: f/2.8 - f/22, 80mm: extended and f/4-f/22
  • Field of View: 35mm: 63°, 50mm: 46°, 80mm: 30°
  • Filter Thread: 52mm
  • Focusing Mechanism: Helicoid
  • Closest Focusing Distance: 0.25m (35mm), 0.4m (50mm), 0.8m (80mm)
    • Macro Adapter: 0.18m (35mm), 0.22m (50mm), 0.5m (80mm)
  • Lens Construction: Lens base: 3 elements in 3 groups, Front lens group: 4 elements in 4 groups for each focal length
  • Multi coating: Yes
  • Electronic Contacts: No
  • Lens body: Aluminum