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TeleVue Ethos EyepieceThe first TeleVue Ethos eyepiece to be introduced was the 13mm which caused a substantial amount of excitement and interest. It was then followed by the 8mm which was equally well received. The 6mm, 17mm and 21m were next, followed by the 10mm. And finally the the 3.7mm which completes an extremely awesome lineup. The eyepiece shown here is the TeleVue Ethos-SX 3.7mm which was developed and crafted to incorporate its exceptionally wide field of view with contrast, color-rendition, distortion correction and center-to-edge sharpness necessary to accomplish that natural view. This is viewed by many as the ultimate eyepiece. And Whilst sharpness is inherent to the optical design, contrast is maximized because of the intelligent use of flat finished baffles and ultra low reflectance, high efficiency coatings that are tuned to the structure of each and every element. Over and above the aspiration to simply achieve 110°, the extended field of view provided TeleVue the cabability to create an outstanding planetary eyepiece having a deep sky true field of view that logically complements the rest of the Ethos eyepiece range.  With 110°, the Ethos-SX has 21% more AFOV area than the 100° Ethos design. This provides for a decent 62% power increase from a 6mm Ethos, whilst maintaining 68% of its TFOV. The 3.7mm eyepiece actually has more TFOV than the 8mm Plössl, 6mm Radian, and 5mm Nagler Type-6. Features
TeleVue 4.7mm Ethos SXThis new TeleVue 4.7mm Ethos-SX, just like its 3.7mm progenitor, was developed and crafted to combine its exceedingly wide field of view with all the contrast, color-rendition, distortion correction and center-to-edge sharpness that is necessary to accomplish that natural view. When compared to a lower power eyepiece with the equivalent TFOV (similar field stop) such as an 11mm Plössl (9.1mm field stop), the greater power, for higher resolution, and smaller exit pupil (for a darker background to enhance contrast) reveals a deep sky experience "even better than you thought possible". The TeleVue Ethos 4.7mm is a 1¼" format and is parfocal with the wide range of 1¼" Tele Vue eyepieces. 2" adapter included.  Features
TeleVue Ethos 6mmIn 1¼" mode, if you use Tele Vue's "high-hat" 2"-1¼" adapter, it will be parfocal with Tele Vue's Plössls, Radians, Type 6 Naglers, Nagler Zooms, 1¼" Panoptics and 8mm ETHOS.  Features
TeleVue Ethos 8mmIn 1¼" mode, if you use Tele Vue's "high-hat" 2"-1¼" adapter, it will be parfocal with Tele Vue's Plössls, Radians, Type 6 Naglers, Nagler Zooms, 1¼" Panoptics and 6mm ETHOS. Further, its light weight and small diameter makes the 8mm suitable for anyone using a binocular viewer. Another application is for spotting scope set-ups with the Tele Vue 60° 1¼" diagonal.  Features
TeleVue Ethos 10mmThe 10mm is parfocal with the 13mm ETHOS. Its 59mm rubber grip diameter makes this model usable in binocular viewers - for most people. 10mm Ethos delivers: 100° apparent field (50% larger in area than 82° Naglers), comfortable eye-relief, (accepts DIOPTRX eyesight astigmatism correctors), distortion correction, high contrast and on-axis sharpness for planetary viewing. It is the “do-it-all” eyepiece perfect for all scopes that can utilize this focal length. And, "filling the hole" between the 13mm and 8mm makes it the ideal centerpiece for a 17mm/10mm/6mm Ethos set. An important benefit of the combination of large apparent field of view and shorter focal length is that for a given field in the sky, higher magnification results in a darker sky background. Fainter stars become visible and more detail is seen on all deep sky objects. Ethos provides another big magnification/contrast jump, yielding dramatic views simply not previously possible in any telescope. With the smaller exit pupil, eyesight limitations are also reduced.  Features
TeleVue Ethos 13mmWe have not specifically endorsed the 13mm Ethos for Bino-Vue use because of the large diameter barrel. Even so, we were advised by Mike Harvey at the Winter Star Party (February 2008) that only 1-person in 25 had interpupilary limits with the bino'd Ethos (63.5-mm for the initial production 13mm). However, since many of our customers have been thrilled with the experience, we have maximized the potential use by narrowing the barrel from 63.5-mm to 62-mm diameter for eyepieces delivered beginning mid-March 2008. While the difference is only 1.5-mm, (or 0.75-mm for pairing a first production unit with current production) we decided to make this small change public, in case you want to give it a try.  Features
TeleVue Ethos 17mmThe 17mm ETHOS is an ideal complement to the 31mm Nagler Type-5. They are parfocal (both have focus locations about 3/8" above shoulder) and the 31mm Nagler Type-5 has exactly twice the true field area.  Features
TeleVue Ethos 21mmThe 21mm focal length completes the logical set of 21mm/13mm/8mm and nicely juxtaposes the 17mm/10mm/6mm combination. Each step within these two sets approaches a 3x field area gain. The 21mm's effective field stop diameter is 36.2mm, bringing its true field close to the 35mm Panoptic (38.7mm Field Stop diameter). Its true field is also larger than the 26mm Nagler with its 35mm effective field stop diameter. In an f/4 Dobsonian, the exit pupil is just 5.25mm using the 21mm Ethos instead of 8.75mm with a 35mm Panoptic, or 6.5mm with a 26mm Nagler.  Features
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