6mm 1.25"/2" 100° field Ethos

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Just like the 8mm TeleVue Ethos before it, the TeleVue 6mm Ethos eyepiece once again raises the bar for shorter focal length eyepieces. It expands the apparent field of view to an astonishing 100°, compared to the 50° field typical of most shorter focal length eyepieces. You can use the field of view calculator below to see just how much sky the 6mm Ethos can reveal with your telescope.

The 6mm Ethos is designed for no-holds-barred high power solar system and deep space observing with any telescope. However, its very wide field makes it particularly convenient for lunar and planetary observing with Dobsonians. It gives you twice as long to observe with a Dob before an object drifts out of the field and the scope has to be repositioned than you get with orthos, Plössls, and similar narrower field eyepieces.

There is a soft rolldown eyecup to shield the eye from ambient light (from a neighbor’s security light, for example) and improve the image contrast. With a usable eye relief of 15mm, the 6mm Ethos might normally 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 6mm Ethos has all the virtues that astronomers have come to expect from a TeleVue eyepiece: high contrast, comfortable eye relief, and full field sharpness – with well-controlled astigmatism, field curvature, lateral color, angular magnification distortion correction, and low pupil sensitivity (kidney bean effect) for daytime use. While 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 6mm 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 6mm Ethos gives you dramatic high power views that are simply not possible with a similar focal length eyepiece, no matter what telescope you use. In addition, the smaller exit pupil of the 6mm reduces eyesight limitations due to astigmatism when compared with longer focal length eyepieces.

The 6mm 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.

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.

6mm
Barrel Size:
The industry standard diameter, as of 2011, is 1.25" and is the most common.  Other sizes available are .965" and 2".
2"/1.25"
Weight:
The weight of this product.
15.5 oz.
Warranty:
Limited Lifetime
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Telescope Eyepiece Formula
To calculate the magnification and approximate actual field of view of this eyepiece on your telescope, enter the focal length of your telescope below and press the "Calculate" button.

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TeleVue - 6mm 1.25"/2" 100° field Ethos

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TeleVue - 6mm 1.25"/2" 100° field Ethos
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Our Product #: TE06
Manufacturer Product #: ETH-06.0
Price: $615.00
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The 100° apparent field of this new TeleVue 6mm Ethos eyepiece provides a new standard in high power “spacewalk” lunar, planetary, and binary star observing . . .





. . . our 34th year