12mm 1.25" Paradigm Dual ED

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This medium focal length Astro-Tech 12mm Paradigm Dual ED eyepiece is usable with any telescope type, under virtually any seeing conditions – from fair to superb. (Rain, snow, or fog might limit its usefulness, however.)

With a short focal length refractor it is a low power eyepiece. With the 430mm focal length Astro-Tech AT72ED, for example, its six lens/four group multicoated dual ED (Extra-low Dispersion) glass optics provide 36x and a field over three times as wide as the full Moon. This is well suited for observing globular clusters such as M13 and M22. Both fit nicely into its 1.67° field with the AT72ED, with a framework of black sky around the clusters to set them off. Its sharpness and lack of astigmatism across the field make globular clusters sharp, vivid, and nearly three-dimensional.

It is also quite remarkable for medium high magnification observing with long focal length refractors, reflectors, or catadioptric scopes. On an 8” f/10 catadioptric, for example, it yields 167x. This is an excellent magnification for planetary and close-up lunar observing, particularly when the high contrast of the eyepiece (rivaling that of orthoscopics and Brandons) is combined with its excellent color fidelity. Its overall performance makes it a much better choice as a second eyepiece than merely doubling the power of most scopes’ so-so standard 25-26mm eyepiece with a Barlow.

The six lens/four group design and two ED (Extra-low Dispersion) glass elements of the 12mm Astro-Tech Paradigm provides all of the optical virtues described at the top of this catalog page – high contrast, a sharp and flat field from edge to edge, excellent color fidelity, and exceptionally low astigmatism and barrel distortion. It has a usable eye relief of 13mm, very good for an eyepiece in this focal length range. Combined with the twist-up eyecup design, the long eye relief makes it a good choice for eyeglass wearers.

This new Astro-Tech 12mm Paradigm Dual ED eyepiece will make you drastically revise your expectations upwards when it comes to how much optical excellence you can get for such a reasonable price.

Field of view:
The field of view (FOV) is the amount of observable world one can see at any given moment.
60°
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.

13mm
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.

12mm
Number of optical elements:
6
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"
Weight:
The weight of this product.
6.4 oz.
Warranty:
2 years
Reviews from Cloudy Nights (www.cloudynights.com)
These reviews have been written by astronomers just like you and posted on the Cloudy Nights astronomy forums . . .
First Look: Astro-Tech Paradigm Eyepieces

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Overall Product Rating: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics(4.83)   # of Ratings: 6   (Only registered customers can rate)

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1. Thomas on 8/24/2013, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
The Paradigm Dual ED 12mm is an excellent eyepiece. Clear sharp image with excellent contrast. Definitely an upgrade from my Plossl ep's. Lagoon Nebula was outstanding in this eyepiece. Telescope used was a 100mm f/6 refractor. Highly recommend this Paradigm eyepiece to anyone who wants to upgrade on a budget. I will be getting the whole set.
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2. Stephen on 5/20/2013, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
I bought one to test in my 8", f/7 Newt and the image was so sharp, with excellent contrast, that I tried it on another, smaller f/6 scope. Same results. I now own 5 different FL Paradigms and they are my "Go-To" eyepieces in all scopes of f/6 or longer. The edge sharpness is as good as center-of-field and the 60* AFOV is a big plus in any Dob. Eye relief on all Paradigms is good so I can avoid spending big $$ on expensive LER eyepieces.

I have "Big-Brand" eyepieces of $200+ each, and still prefer the Paradigms. The price is WAY under what you get in performance.
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3. Nate on 3/11/2013, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
Very nice eyepieces for the money! If you're looking for something inexpensive, but good quality, I think these are just right. The optics seem very good, the FOV is fine for most uses and the adjustable eye cup is a nice touch. I use these and the 82 degree ES eyepieces most and while the ES have a larger FOV and are nicer in some ways, these don't give up much for being so much less expensive. Nothing about them feels cheap.
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4. Matt on 10/27/2012, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
Excellent eyepiece. Flat field of view edge to edge. Twist up adjustable eyecup is a nice feature. Performed great on planets as well as DSO's. background was dark even in my light polluted viewing location
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5. Jim on 9/27/2012, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
Decent build quality and comfortable to look through. Sharp and clear views all for $60.00....a very good deal!
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6. George on 9/12/2012, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
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52mm x 80mm eyepiece container
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Astro-Tech 12mm Paradigm Eyepiece
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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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Astro-Tech - 12mm 1.25" Paradigm Dual ED

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Astro-Tech - 12mm 1.25" Paradigm Dual EDImage showing a typical Paradigm eyepiece with the twist-up eyecup in both the fully extended and fully retracted positions.Sketch of Saturn by Carlos Hernandez as seen through a 12mm Astro-Tech Paradigm eyepiece.
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This Astro-Tech 12mm Paradigm Dual ED medium power eyepiece has outstanding performance at a price that will make you wonder why other good quality eyepieces cost so much more . . .





. . . our 34th year