1/19/2011 · First, even with the most optically perfect 3.7mm eyepiece in the most optically perfect, well-collimated scope, the zone within which a 3.7mm EP will come to sharp focus is fairly narrow, especially as the focal ratio of the scope it is used in becomes shorter and the light-cone becomes steeper.
I used Algieba as an evaluation star for the eyepiece. The 3.7mm Ethos produced 190x with the 102mm APO making the split of Algieba very easy. After simply enjoying the view of this showcase double for a while I noted that I was very impressed with how wide the FOV was.
7/17/2015 · With the 3.7mm Ethos-SX 110° eyepiece, Tele Vue has delivered a true space simulator experience with ‘spacewalk’ views. Our rating 5.0 out of 5 star rating 5.0, 9/26/2013 · The TeleVue Ethos eyepiece line has redefined the ultra-widefield observing experience. Introduction It took some time for me to realize that a seismic shift was about to take place in amateur astronomy when TeleVue announced a new eyepiece design at the 2007 Northeast Astronomy Forum. I had been using the Nagler series for almost a decade;…, 10/20/2010 · The 3.7 mm has an impressive 110 degree FOV and comes with a 2 adapter that doubles as a display stand, so you can impress your friends in the day time. At 20.6 ounces, the 13 mm is heavy, but it’s lighter than you might think if you own Naglers or Panoptics.
12/14/2016 · The Moon is plenty bright at 0.63mm exit pupil of the or even 0.49mm exit pupil when using the 3.7mm Ethos on your ‘scope. Either or both would be fantastic for observing the Moon but for Planets the 3-6mm Nagler Zoom is highly versatile and recommended so that you can fine tune your magnification to suite the seeing.
8/21/2010 · Nice review Shane, and you raise a very important point – replacement of existing lenses with fewer but higher quality EP’s – the 13mm and a 6mm Ethoi could replace 6 plossls 32, 26, 15, 10, 8, and 6 mm and pretty much maintain the same FOV for the range and get a gain in magnification across the Fields of view.
With 110°, the Ethos-SX has 21% more AFOV area than the 100° Ethos design. This permits a nice 62% power increase from a 6mm Ethos, while retaining 68% of its TFOV. The 3.7mm actually has more TFOV than our 8mm Plössl, 6mm Radian, and 5mm Nagler Type-6! In 1¼ mode, it is parfocal with the wide range of 1¼ Tele Vue Plössls, Panoptics, Radians, …
TeleVue is known for its in-house eyepiece and telescope designs by Al Nagler; our latest eyepieces brings new meaning to the term in-house. The concept for this eyepiece series was proposed by Tele Vue President David Nagler, with performance parameters giving it the fundamental characteristics (the ethos ) of a Tele Vue eyepiece: high contrast, comfortable eye relief and full field sharpness.
1.25-inch format and is parfocal with the wide range of 1.25-inch Tele Vue Plossls, Panoptics, Radians, Naglers, Nagler Zooms, and 6mm and 8mm Ethos eyepieces. The screw-on 2-inch adapter (included) is designed to make it parfocal with 13mm and 10mm Ethos when they are used in their 2-inch modes –
