TeleVue Delos 72° Apparent Field EyepiecesConcept: It was natural to take lessons learned from the tremendously successful Ethos project and apply it going forward. In the fall of 2008 Paul Dellechiaie was tasked to investigate a long eye-relief eyepiece design in the 70° AFOV range retaining the key performance goals met with Ethos. My father named Paul's design "Delos." Delos is a beautiful Greek island which happens to be the mythical birthplace of Apollo god of light. More importantly the name was chosen to give recognition to Paul principal designer of both Delos and Ethos. — David Nagler Introducing DelosTele Vue is pleased to introduce the Delos mid-to-short focal length line of 20mm eye-relief 72° apparent field of view eyepieces. Every optical mechanical and ergonomic aspect was rethought to achieve reference-standard performance for any visual application.The Delos was conceived as a narrower field Ethos. Reducing the field to 72° allowed freedom to increase eye-relief while controlling pupil aberrations all without making the eyepiece too large. With Ethos performance standards as benchmarks the Delos design achieves full field sharpness virtually perfect fθ (theta) distortion mapping and color neutrality. Image fidelity is maximized utilizing glass matched multicoatings and anti-reflection surfaces throughout the eyepiece.Contrast is further enhanced with a new continuously adjustable height eyeguard system that can be locked in any position. Since the Delos eye-lens measures a quite large 35mm in diameter preventing stray light from reflecting off the first surface and extraneous light from entering your eye pays off in a nice increase in percieved contrast. The eyeguard's sliding action allows for positioning the soft rubber eyeguard at the ideal height to suit the observer's preference. Indicator marks on the eyepiece body are handy reference guides for setting your perfect postition.
