Baader O-III Filter 1.25" (10nm) visual
US$ 83.02- ultra hard and bright O-III visual contrast for 6" and larger telescopes
- no visual color fringing, just pure O-III
- non-ageing sealed coating edges
Baader O-III Filter 2" (10nm) visual
US$ 144.18- ultra hard and bright O-III visual contrast for 6" and larger telescopes
- no visual color fringing, just pure O-III
- non-ageing sealed coating edges