Buy Televue 31mm Nagler Type 5 2 inch EyepieceTelevue 31mm Nagler Type 5 2 inch Eyepiece Product Description:
- 2" Barrel
- 82 degree Apparent FOV,
- 19mm Eye Relief,
- Field Stop of 42 mm
- 6 Elements
Product Description
It has now been 20 years since Tele Vue designed the original 13mm Nagler eyepiece. From then on Tele Vue has always sought ways to obtain the largest possible true fields (i.e. longer focal length) while maintaining the basic Nagler concept; 82 degree apparent field with good correction to the edge. The previous Nagler versions were not conducive to scaling to longer focal lengths. A totally innovative design using four different exotic glass types (some larger than the 70mm Pronto objective!) in a 6 element configuration, opened the door to the largest true field possible in the Nagler eyepiece family. With fewer elements, Tele Vue also retained the high contrast achieved on the Radians and Nagler Type 4s. Although the sheer size and element shapes preclude using an "instadjust" eyeguard, the eye- relief is quite comfortable and the weight was actually kept below that of the 20mm Nagler Type 2! The true field is, however, more than 50% wider (or 2.35x the area). Tele Vue hopes the 31mm Nagler Type 5 gives you as much of a "spacewalk" jolt as the original 13mm Nagler did 20 years ago.
Customer Reviews
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7 of 7 people found the following review helpful.
Awesome Wide Field Telescope Eyepiece
By Morgan Davies
This is a fantastic eyepiece for visual astronomers who are deep sky enthusiasts.I have observed through various telescopes through a 31 Nagner: a fine 76mm f6.3 apochromatic refractor, a 100mm f8.6 apochromatic doublet, a 12.5" f5 newtonian, a 16" f10 cassagrain, and a 25" f5 dobsonian. The eyepiece performed admirably in all these scopes at all these focal ratios.Because the 31mm Nagler has such a sharp, wide field of view, it helps me find celestial objects more easily than I could with an eyepiece with a narrower field of view, such as a plossl, or a lesser wide field eyepiece that turns stars into "seagulls" near the edge of the field of view. I can see more stars, more contrast, and more detail than I can see with a lesser wide field eyepiece. You get what you pay for. Even at f10 I have found that premium eyepieces significantly outperform more moderately priced eyepieces.I see more stars in the 31 Nagler than I can in a lesser eyepiece of similar focal length. Stars appear sharp, brilliant, even colorful: golden, fire engine red, lemon yellow, pale blue, green, and of course, pure white.Because my telescope is relatively fast at f5, and because I am fussier about optics than most, I thought I may need a Paracor coma corrector coma. But at f5 coma was barely detectable, and certainly not objectionable.Even with a big scope like mine, the true field of view is an impressive 1.6 degrees. This made celestial objects easy to find, and a joy to observe.The first time I had it out under a dark sky I enjoyed my best ever view of the M31 Andromeda galaxy. Both companion galaxies M32 and M110 were well within the field of view. Contrast was excellent. Observers lined up for a view through the eyepiece - especially after one astronomer uttered an expletive when he observed three magnificent galaxies in one field.Not all eyepieces - including many premium long focal length eyepieces - have enough eye relief to allow me to observe with eyeglasses. I can not see the edge of the field of view. Why pay a premium for a view that you can not see? Because the 31 Nagler has plenty of eye relief, I can observe in comfort, and see right to the edge.Many describe the view through a Nagler eyepiece as a "spacewalk". Instead of just looking at a celestial object, you feel almost as if you are floating in space in front of it. I find this effect particularly through the 31 Nagler.I can think of three cautions for this eyepiece:1. It's big and heavy. At 2.2 pounds (1kg) it may throw some telescopes off balance.2. It ain't cheap. But you get what you pay for.3. If you look through one, you will want one. See caution #2.For a low power "finder" eyepiece, and for observing large celestial objects, I give the 31 Nagler my highest possible recommendation.
3 of 4 people found the following review helpful.
Premium Eyepiece
By Anton
I'll keep this review relatively short because I am not an expert in all things astronomy--nor am I an expert in accessories for telescopes.I just bought a 12" Dobsonian scope, and after being disappointed with the views from my stock eyepieces I began researching for better ones. The Tele Vue Nagler line was mentioned to me from several individuals who are much more experienced in astronomy and imaging than I am. I went with the 31mm because of the size of my scope's aperture. If you are reading this post and are new to astronomy as well, you will want to find out your scope's specs (such as aperture, focal length, eye relief etc.) and also what kind of observing you are planning to do BEFORE buying any eyepieces--particularly expensive eyepieces.So once more, I chose the 31mm because of my scope's large aperture (around 300mm) and my desire to stargaze. The 31mm is intended for wide-field use and not high-magnification observing of things like planets (you can purchase smaller eyepieces with higher magnification from the Nagler line as well if you wish--I bought the 7mm for example). With this eyepiece you will gain a much wider view of the cosmos through your eyepiece-- 82 degrees worth. Along with the increased spacing will be a view without distortion. In stock or cheaper eyepieces it's very easy to look away from the center point of your lens and find that many of the stars around the edges are skewed or distorted. This is simply not the case with the Nagler lens and after my very first glance in the tube, I could literally "see" what I paid for.The eyepiece is a monster--it weighs around 2 pounds and it makes a 12oz. soda can look like its offspring. This may pose a problem for users with smaller refracting scopes or even small dobs, meaning you will have to counter the balance of these types of scopes with weights. My 12" Dob seems to work rather well with the piece but I can credit this with my scope's bearings. Again do some research and find out exactly what size and type of lens you will need before purchasing one.I ordered through Amazon and the pieces arrived in perfect condition as they were obviously shipped by professionals who know their products well.All in all it's a very fine piece; it's rather expensive but in optics you generally "get what you pay for". But again for any newcomers there are many, many variables which will affect your viewing experiences, such as atmospheric conditions, weather, location, light pollution and limitations of your equipment. Again, get to know your fundamentals before buying a telescope online and picking up a few expensive eyepieces!
2 of 4 people found the following review helpful.
Ooooh so nice.
By KEVIN
I have a few Ethos (6, 10, 17) along with a Pentax XW40 and a 55 erfle. The 30mm range was kind of missing. During a recent star party a buddy loaned me his 31 Nag and I loved it. I found a deal on the classified for the TV 31mm Nagler and jumped all over it. Now I feel the EP collection is complete.At the new price I was waffling but it seems pretty easy to save $100-$200 used with some patience.
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Not the same quality 10 years later
We just adopted 2 new puppies. This is essential if you want to get any thing done during the day.
Rough edges, metal pieces and patchy 'gold zinc'
