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TeleVue 12mm Nagler Type 4

Replacing not only the 12mm Nagler Type 2 but its predecessor 13mm (my first Nagler) and the 11mm, now considered a collector item. Users confirm that for deep sky viewing, the comfort, clarity and contrast of the 12mm Type 4 gets us closer to our "spacewalk" viewing goal.

$355.99
Nagler Type-4 Eyepieces

Applying the experience of the Radian development to the 82° Nagler series, yielded more contrast, reduced pincushion, more true field, longer eye-relief, and fewer elements. With added eye-relief, the click-stop Instadjust eyeguard helps maintain proper eye distance and centration.

For deep sky viewing, the comfort, clarity and contrast gets us closer to our "spacewalk" viewing goal.

Why Are There 3 Types of Naglers?

To achieve the full magnification range over 82° apparent field of view requires two types: Nagler Type-5 with focal lengths of 31, 26, 20, 16mm and Nagler Type-6 with focal lengths of 13, 11, 9, 7, 5, 3.5, 2.5mm.

The Type-5 permits the largest true field possible (31mm has 42mm field stop), while the shorter focal length Type-6 models are parfocal, with similiar size and weight and all with a comfortable 12mm eye relief.

The Type-4 models feature about 18mm of eye relief and with the "instajust" eyeguard are best for eyeglass wearers or Dioptrx users in their 22, 17, 12mm focal length range.

12-mm
Model # EN4-12.0
Focal Length (mm) 12
Barrel Size (in.) 2" & 1¼"
Apparent Field of View (deg.) 82
Eye Relief (mm) 17
Weight (lb / oz) 1.01 / 16.2
Field Stop (mm) 17.1
Nagler Type-4 Eyepieces

Applying the experience of the Radian development to the 82° Nagler series, yielded more contrast, reduced pincushion, more true field, longer eye-relief, and fewer elements. With added eye-relief, the click-stop Instadjust eyeguard helps maintain proper eye distance and centration.

For deep sky viewing, the comfort, clarity and contrast gets us closer to our "spacewalk" viewing goal.

Why Are There 3 Types of Naglers?

To achieve the full magnification range over 82° apparent field of view requires two types: Nagler Type-5 with focal lengths of 31, 26, 20, 16mm and Nagler Type-6 with focal lengths of 13, 11, 9, 7, 5, 3.5, 2.5mm.

The Type-5 permits the largest true field possible (31mm has 42mm field stop), while the shorter focal length Type-6 models are parfocal, with similiar size and weight and all with a comfortable 12mm eye relief.

The Type-4 models feature about 18mm of eye relief and with the "instajust" eyeguard are best for eyeglass wearers or Dioptrx users in their 22, 17, 12mm focal length range.

12-mm
Model # EN4-12.0
Focal Length (mm) 12
Barrel Size (in.) 2" & 1¼"
Apparent Field of View (deg.) 82
Eye Relief (mm) 17
Weight (lb / oz) 1.01 / 16.2
Field Stop (mm) 17.1
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Existing reviews
From: scottayer@sbcglobal.net | Date: 10/16/2009 1:48 PM
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A Black Out Problem
See my review of the 22mm Nagler. Further, this lens has less contrast and apparent sharpness that the 22 nagler. Nevertheless, I like the eyepiece.
From: kcorson@qwest.net | Date: 10/16/2009 1:48 PM
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Great Eyepiece!!
I own the whole nagler type 4 line & really like them all!  there is a small blackout problem with this & the other t4 eyepieces,  but nothing terrible.  id put this eyepiece against any other 12mm eyepiece for contrast, fov & pinpoint stars across the entire field of view.  in a 8 f10 scope this eyepiece is amazing!!!   the instajust eyeguard is a great addition to the tv nagler line!   nothing but a 10 for this one!!
From: vpdwl@aol.com | Date: 10/16/2009 1:48 PM
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Open the pod bay doors, Hal!
This is the truest spacewalk EP I own. I was expecting black-out effects, however they were negligible, and once I learned the proper pupil placement - nearly non-existant. I have compared it to the 13mm T6, which was less engaging - it didnt give that same feeling of wow (even though eye placement was less critical).

This is an EP others can be measured against.
From: mike.corrieri@attbi.com | Date: 10/16/2009 1:48 PM
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12mm Nagler type 4
I compared the 12mm t4 with a barlowed 22mm t4 on Saturn during a very calm (great seeing) night. I was surprised when I saw a sharper image with the barlowed 22mm t4 than with the 12mm t4. This was confirmed by
another observer that night.
From: dcarr7@yahoo.com | Date: 10/16/2009 1:48 PM
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Does not meet the hype
This eyepiece was a disappointment, especially considering the $300+ price I paid.

On my 11 SCT, the views are wide, but heavily washed-out with internal glare. I had to recheck the stats to see if they claimed blackened edges on the glass. They do, but you wouldnt know it by the results.

The sharpness is acceptable on my 4.7 refractor, but is well below the performance of my Axiom eyepiece on the 11 SCT.

I will be selling the 12mm Nagler, and getting another lens.
From: 767a@comcast.net | Date: 10/16/2009 1:48 PM
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typical televue
You want to love this ep...you really do. When you position your eye...just so...it has fantastic contrast. Its well made, but tricky even so. Screw in a filter too tightly and try to unscrew it: watch out as the whole lower assembly will unscrew with it. The next sounds you hear could be very expensive as itsy bitsy lense elements lurk ready to fall! The Insta-just eyepiece shield is next to useless. There IS ghosting and the kidney bean, but the latter is less an issue the longer you work with this ep. If you have a 1.25 compression ring diagonal the hybrid 1.25-2 barrel is a true hassle to use. But on nights of so-so seeing this is a wicked good ep for planets and M42 etc, and some of my best views have been thru this ep. Go figure!
From: cwroundabout@yahoo.com | Date: 10/16/2009 1:48 PM
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paying for the name
To put it plain and simple...I dont like it. Stars seem washed out with internal reflections.
For $300+ I am deeply disapointed and expected much better.
Im giving it a 2 for craftsmanship.
For about half the price my Radian is superior.
From: stargazer24@verizon.net | Date: 10/16/2009 1:48 PM
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Love This Eyepiece!
This is my first Nagler so I have only the plossls that came with my scope to compare it with.  It gave me a big wow feeling to look through!  Also, I may add, it does great barlowed (TV 2xBarlow). I do not wear eyeglasses, so I leave the eyeguard all the way down - getting those huge sharp views! I have an Orion 10XTi Dob that I use this with - no balance issues. This is a real keeper - I will be looking into getting the 17T4 in the future!  
From: lauriew62@gmail.com | Date: 10/16/2009 1:48 PM
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