8mm 1.25" Paradigm Dual ED

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This Astro-Tech 8mm Paradigm Dual ED eyepiece is a logical choice for high quality/high magnification observing with long focal length refractors, reflectors, or catadioptric scopes under good to somewhat better than average seeing conditions. Below average seeing conditions may limit its performance.

If so-so seeing is the norm where you observe, its 8mm focal length may represent the shortest focal length practical with a long focal length telescope for observing lunar and planetary detail, resolving globular clusters, picking up small planetary nebulas against a stellar background, etc.

Contrast is very good for planetary and lunar use, rivaling that of orthoscopics and Brandons, but with a substantially wider field of view and excellent eye relief. Its sharpness and lack of astigmatism across the field makes smaller globular clusters vivid and nearly three-dimensional.

The six lens/four group design and two ED (Extra-low Dispersion) glass elements of the 8mm 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, excellent 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 8mm Paradigm Dual ED eyepiece will make you rethink your expectations about just how good an 8mm eyepiece you can get for such a reasonable price – and make you wonder why other manufacturers can’t do as well.

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.

8mm
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 Eyepiece

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Overall Product Rating: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics(5.00)   # of Ratings: 6   (Only registered customers can rate)

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Showing comments 1-6 of 6
1. Ray on 6/26/2015, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
Beautiful fit and finish,sharp with good contrast. I plan too buy more of the series.
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2. Bob on 7/30/2014, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
I have had four of these in various focal lengths for a few years, now just waiting for the 12mm to come in to complete the set. Excellent all-around wide field, long eye relief EP. I find myself grabbing for these every time out even though I have more expensive EPs. If you're just starting your EP collection, other specialty EPs can wait. Get these first as a basis for your collection. If you have to stick with a handful of EPs, these should be it.

One exception - for high power planetary get an ortho or two IF you're fussy about every tiny bit of detail. Otherwise these are the EPs to have for everything else. I even grab for the 5 and 8mm Paradigms for planetary simply because the FOV is so comfortable and viewing is more enjoyable. The contrast isn't quite what a Plossl or Ortho can do but only by a small amount (because you're looking through more glass elements in the Paradigm), but the small difference in contrast is more than made up for by the FOV and sharpness across most of the field. I still usually go for the Paradigm and enjoy! These at least match a good high power planetary EP and Barlow of similar equivalent focal length but with better FOV.

As others have said, if you use a Dob or any undriven scope, these are the basic set to have by a large margin - your no-brainer solution to a great set of EPs, even when compared to those in the higher price ranges. When I look through them, even after years of use and with a few Televues etc. in the "jewelry box," I find myself mumbling, "I love these Paradigms!" Glad I bought them before the price goes up to what it should be. For once I got the better end of the deal.
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3. Thomas on 7/23/2014, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
All I can say is - EXCELENT. For the money you can not beat this EP. Excellent contrast, great FOV and good eye relief. I have the whole set and they are my GO TO ep's on all my scopes. I prefer them over my much more expensive EP's for contrast, and viewing quality. Get the set, you will not be unsatisfied.
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4. John on 8/5/2013, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
I already owned the Paradigm 25mm eyepiece, bought at a local swap meet/sale; I was really impressed with the increased contrast, sharpness, and detail along with a wider field of view compared with a Plossl. A really visible difference. I am equally impressed with the 8mm. It is very sharp, images are crisp and detailed. The views compare well with far more expensive eyepieces I've used. I know I'll be using these for a long time to come. Thanks for providing such a great eyepiece design at a really reasonable price. (John K.)
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5. alvaro on 5/1/2013, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
With some modifications to my cheap telescope setup (4.5") I was able to and stack up pictures of Saturn and get a glimpse of Saturn's Cassini divisions. Something quite difficult with a 4.5" Bird-Jones telescope. These eyepieces are worth more their price.

Alvaro
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6. George on 9/13/2012, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
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Astro-Tech 8mm Paradigm Eyepiece
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Astro-Tech - 8mm 1.25" Paradigm Dual ED

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Astro-Tech - 8mm 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 details visible on Saturn by Carlos Hernandez as seen through an 8mm Astro-Tech Paradigm eyepiece.
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This Astro-Tech 8mm Paradigm Dual ED eyepiece has excellent color fidelity and contrast, exceptionally low distortion, and a low price that will make you wonder why others charge more for less high power performance . . .





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