10mm 1.25"/2" 100° field Ethos

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The 10mm TeleVue Ethos is a “do-it-all” eyepiece that is perfect for all telescopes that can utilize this focal length. And, as it fills the hole between the 13mm and 8mm Ethos eyepieces, the 10mm makes an ideal centerpiece for a state-of-the-optical-art 17mm/10mm/6mm Ethos set.

The 10mm Ethos has a soft rolldown eyecup. It shields your eye from ambient light (from a neighbor’s security light, for example) to improve the image contrast. With a usable eye relief of 15mm, the 10mm Ethos normally might somewhat vignette the field of view for some eyeglass wearers. However, since the 100° field is so wide that you can’t see the full field without having to move your head from side to side to take it all in anyway, vignetting in the conventional sense is not a problem.

The 10mm Ethos has all the high contrast, comfortable eye relief, and full field on-axis sharpness virtues that astronomers have come to expect from a TeleVue eyepiece. It has well-controlled astigmatism, low field curvature, and virtually no lateral color or angular magnification distortion. It addition, it has low pupil sensitivity (kidney bean effect) for daytime use. While its sharpness is inherent to the optical design itself, the contrast is maximized through the intelligent use of flat finished baffles and ultra low reflectance, high efficiency coatings that are tuned to the composition of each lens element.

Compared to any longer focal length eyepiece (even the 13mm Ethos), the higher magnification of the 10mm Ethos provides a darker sky background, with fainter stars becoming visible and more detail showing in all deep sky objects. With its incredible 100° field, the 10mm Ethos gives you dramatic views that are simply not possible with a narrower field similar focal length eyepiece, no matter what telescope you use. In addition, the smaller exit pupil inherent in the 10mm focal length reduces eyesight limitations due to astigmatism when compared with the larger exit pupils of longer focal length eyepieces.

The 10mm Ethos has concentric 1.25” and 2” barrels that allow it to be used in both 1.25” and 2” focusers and star diagonals without the need to change the diagonal or eyepiece adapter. A safety groove is machined into the 2” chrome barrel to engage your focuser thumbscrew. This will help prevent the eyepiece from falling should the thumbscrew accidentally loosen while observing. A rubber grip ring provides a sure grip in cold weather when wearing gloves or mittens.

The 10mm Ethos has a maximum barrel diameter of 61mm, making it more usable in binoviewers than its larger diameter 13mm big brother. In a binoviewer, a pair of 10mm Ethos eyepieces provides the ultimate in virtual 3-D “spacewalk” observing.

The 10mm TeleVue Ethos eyepiece will accept TeleVue Dioptrx eyesight astigmatism correcting lenses. It is parfocal with TeleVue Radian, Plössl, Type 6 Nagler, and 1.25” Panoptic eyepieces.

Field of view:
The field of view (FOV) is the amount of observable world one can see at any given moment.
100°
Eye Relief:
Eye relief is the distance from the last surface of the eye lens of an eyepiece to the plane behind the eyepiece where all the light rays of the exit pupil come to a focus and the circular image is formed, sometimes called the “Ramsden Disk.” This is where your eye should be positioned to see the full field of view of the eyepiece. If you must wear glasses because of astigmatism, you’ll usually need at least 15mm of eye relief or longer if you want to see the full field of view with your glasses on.

A note on our eye relief figures: Quite often, our eye relief figures will differ from those of the manufacturer. This is because we measure the “usable” eye relief, while the manufacturers specify their usually-longer (but technically correct) “designed” eye relief.

The eye lens of the eyepiece is normally recessed below the rubber eyeguard or rubber rim of the eyepiece to keep the lens from being scratched during use. An eyepiece might have a “designed” eye relief of 15mm (and the eye relief will truly measure 15mm from the eye lens to where the image forms). However, if the eye lens is recessed 3mm below the eye guard, the Ramsden Disk forms only 12mm above the eyepiece body (the 15mm “designed” eye relief, less the 3mm of eye relief made unusable by having the eye lens recessed into the body of the eyepiece). This “usable” eye relief of 12mm (measured from the rolled-down eyeguard – the closest point you can get your eye to the eye lens – to where the image forms) is the eye relief figure we would measure and list in this website.

Why is it important to list the “usable” eye relief? For those people who don’t wear eyeglasses while observing, a few mm difference between the eye relief they expect from the manufacturer’s literature and the shorter eye relief they actually get in real life doesn’t mean a lot. They can simply move a little closer to the eyepiece to see the full field, and never realize that the eye relief is a little shorter than they expected. However, some people must wear eyeglasses while observing, because of severe astigmatism. These observers can’t move closer to the eyepiece if the eye relief is shorter than expected because their glasses get in the way. For these people, the real life “usable” eye relief is more important than the technically correct but sometimes not fully usable “designed” eye relief. We measure and list the actual usable eye relief so that people in the real world can pick the eyepieces that will work best for them.

15mm
Focal Length:
This is the length of the effective optical path of a telescopeor eyepiece (the distance from the main mirror or lens where the lightis gathered to the point where the prime focus image is formed). Focallength is typically expressed in millimeters.

The longer the focallength, the higher the magnification and the narrower the field of viewwith any given eyepiece. The shorter the focal length, the lower themagnification and the wider the field of view with the same eyepiece.

10mm
Barrel Size:
The industry standard diameter, as of 2011, is 1.25" and is the most common.  Other sizes available are .965" and 2".
1.25"/2"
Weight:
The weight of this product.
17.7 oz.
Warranty:
Limited Lifetime
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1. Avery on 5/7/2013, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
I loved the Ethos 21mm so much - I just had to get the 10 and 17mm pieces to keep the spacewalk pump at peak levels!!! ha! Seriously though - these eye pieces, when paired with a Tele Vue diagnal produce images that are clearer and more refined than anything I could have hoped for. While I still have my sight - I wanted the best... And I am so happy with my purchase!!! I cant wait to get a new scope so I can justify getting the rest of the Ethos line! :)
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TeleVue - 10mm 1.25"/2" 100° field Ethos

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TeleVue - 10mm 1.25"/2" 100° field Ethos
 AstronomicsAstronomicsAstronomicsAstronomicsAstronomics (Average: 5.00 | Users: 1)  Only registered users can submit ratings - Register Here
Our Product #: TE10
Manufacturer Product #: ETH-10.0
Price: $650.00
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This TeleVue 10mm Ethos eyepiece has a huge 100° apparent field of view that provides the some of the most spectacular and impressive wide field deep space images you will ever see through your telescope . . .





. . . our 34th year