The 2" Aero SWA eyepieces feature a 6-element construction in four groups. Exotic ED glass is employed in the design to significantly reduce false colour. These eyepieces all feature impressively wide 68 deg fields of view, with virtually distortion-free images. Multi-coating is applied to all air-to-glass surfaces to increase light transmission and image contrast. All models feature edge-blackened lens edges and are parfocal. The eyepiece barrels are threaded to accept standard 2" filters. Twist-up rubber eyecups and generous eye relief for spectacle wearers. Finished in high-gloss anodized aluminium with knurled rubber grips. Available in focal lengths of 30mm, 35mm & 40mm, with eye relief of 16.7mm, 17.5mm & 20mm respectively.