For the ultimate immersive, wide angle experience, the exotic Myriad eyepieces have staggering apparent fields of 100 or 110 degrees! Myriad 3.5mm and 5mm models are constructed with 8 lens elements in six groups, and the 9mm and 20mm models have 9 lens elements in six groups. All models are fully broadband multi-coated with blackened edges for maximum light transmission and contrast. Myriad 3.5mm, 5mm and 9mm models will fit both 1.25 inch and 2 inch focusers (2 inch sleeve is removable) whilst the Myriad 20mm model is 2” only. Eye relief is 15mm on all models except the Myriad 9mm which has 13mm eye relief. Threaded for standard 1.25 inch and 2 inch filters (3.5mm, 5mm & 9mm models) whilst the Myriad 20mm accepts just 2” filters . Soft twist-up rubber eyecups. Finished in high gloss anodised aluminium.