The TeleVue Delos eyepieces are 72° field/20mm eye relief versions of TeleVue’s famed 100° to 110° field Ethos eyepieces. The TeleVue DeLite eyepieces are lighter and more compact 62° field/20mm eye relief versions of the Delos.
As such, they share all of the optical virtues of the Ethos design – full field sharpness, virtually perfect distortion mapping, and color neutrality – simply with a somewhat narrower field (but longer eye relief) than the Ethos. Since each Delos and DeLite is priced well below the comparable focal length Ethos, you give up a little field of view (but none of the Ethos performance quality) to gain some eye relief and save a lot of money.
Image fidelity is maximized by using a variety of specialized anti-reflection multicoatings that are individually matched to the performance of the specific premium glass types used in the different lenses in each Delos and DeLite eyepiece.
Contrast is enhanced by the use of a new continuously adjustable soft rubber eyeguard that can be locked in place at any height desired to accommodate your eye and possible eyeglass use. A properly adjusted eyeguard results in a nice increase in perceived contrast. There are reference marks on each eyepiece body for returning its eyeguard to the perfect position for your eyesight should it be moved accidentally or changed for a different observer.
For those observers with astigmatism who prefer not to use eyeglasses while observing, the rubber eyeguard can be used with optional TeleVue Dioptrx astigmatism correcting lenses. The 1,25” Delos and DeLite eyepieces are parfocal with all other TeleVue 1.25” eyepieces. Each is threaded to accept standard 1.25” eyepiece filters. The relatively narrow body of the Delos and DeLite make them excellent for use in a binoviewer.