William Optics SWAN is a well-designed, wide-angle eyepiece with large lenses for small amounts of money. Own field of view of the eyepiece (AFOV) equal to 72 °. The optics are fully covered with good anti-reflective layers. • own field of view equal to 72 °
• all glass - air boundaries covered with very good layers
• extraordinary correction of chromatic aberration
• sharpness and good contrast
• parfocal with glasses from the series
• the whole interior of the eyepiece well blackened (baffle, the edges of the lens)
• Extremely large offset of the base tube equal to 28 mm
• anodized black body, mechanically resistant
• equipped with a 2 "filter thread • model: SWAN 40
• focal length: 40 mm
• optical construction: 5 elements in 3 groups
• own field of view (AFOV): 72 °
• eye relief : 28 mm
• Luminaire diameter: 2 inches
• layers: FMC
• parfocality: yes
• weight: 570 g 2 years
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