TeleVue Ethos 8mm


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Brand and Model:TeleVue Ethos 8mm
Price ($USD):585
Type:100 AFOV
Focal Length:8 mm
Barrel Size:1.25/2
Apparent FOV:99.9 degrees
Field Stop Dia.:13.9 mm
Eye Relief:15 mm
Elements:8
Weight (lbs):.95
Description:At NEAF 2008 Televue was pleased to demonstrate a new 8mm focal length, 100° AFOV Ethos eyepiece. In addition to matching all the key performance criteria of its 13mm sibling, the new 8mm version is parfocal in 1¼" focusers with Radians, Plössls, Type 6 Naglers and 1¼" Panoptics. Further, its lighter weight and smaller diameter than the 13mm Ethos 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. In comparing it to our 8–24mm Zoom eyepiece, the 8mm Ethos has the power of the 8mm Zoom and 83% of the field of the 24mm setting!

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. The Tele Vue Ethos eyepiece 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.

Televue 8mm 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.

Vote Highlights Vote
TeleVue Ethos 8mm
I have both the 8mm and the 13mm. The 13mm is an obvious work horse in my 16" f4.5 dob with Paracorr, but so is the 8mm. I find myself using the 8mm more than I thought I would when I bought it. The 13 gives me a 2.5 mm exit pupil and the 8mm gives me a 1.5mm exit pupil. The 8 is better on small, faints DSOs including many galaxies. Although it's far from small or faint, I actually found I preferred the higher magnification view offered by the 8mm on M51. Depending on the evening and seeing the 8mm may also be better on globs and of course planetary nebula. When viewing globs and galaxies at high power, it's easy to appreciate the extra field of view offered by the Ethos over a Nagler.

Overall Rating: 10
Optics:10 Value:9
Weight: 5 (Veritable Vote)
Date:
By: jalp
Link to this vote: http://www.excelsis.com/1.0/displayvote.php?voteid=596324


TeleVue Ethos 8mm
I have several Ethos and I must say that I love them all. The 8mm is excellent for planetary nebula, planets and lunar observations. This eyepiece hits a nice high power option on my 16" F4 dob. I like the 8mm so much that I just purchased a 6mm for primary use in my 60mm scope that rides on a manually operated alt-az mount. Give and Ethos a ride, it's the best thing out there in my opinion.

Overall Rating: 10
Optics:10 Value:10
Weight: 5 (Veritable Vote)
Date:
By: crazyqban67
Link to this vote: http://www.excelsis.com/1.0/displayvote.php?voteid=596098


TeleVue Ethos 8mm
This EP combines the best characteristics of the Nagler and Radian eyepieces. Wide AFOV along with long eye relief. The 15mm eye relief allows nearly the entire 100 degree field to be taken in comfortably without moving your head around. Also, there is very little blackout, even when observing objects in the daylight you have to move your head around to induce blackout. Excellent image sharpness is maintained from the center out to about 90 percent of the field. Sharpness is comparable to the best Plossl’s and Orthos I have used. Color appears to be neutral and slight CA can seen on bright objects along the edge of the field.
The down side is cost. The Ethos line is selling for $600+. The upside is that you can get away with owning less eyepieces. I’m down to using 3 eyepieces for most of my observing. I find that the 8mm & 13mm Ethos, and 22mm Nagler t4 can be used in both of my SCT’s (8 & 11 inch) and 4 inch refractor without reaching back into my eyepiece case.

Overall Rating: 10
Optics:10 Value:8
Weight: 1 (Unreliable Vote)
Date:
By: Anonymous (xxx.xxx.40.232)
Link to this vote: http://www.excelsis.com/1.0/displayvote.php?voteid=583494

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