Televue 20mm nagler type 5 eyepiece skies unlimited. Televue 17mm nagler is a very popular eyepiece because it combines long eye relief, a wide field, and is useful in just about any telescope. I use the eshrcc in reflectors and am happy with it. Over the years, ive heard many interesting stories on the origin of the nagler eyepiece, especially on internet forums, so i thought id set down what ive discussed at many convention talks worldwide while i still retain some memory faculty. The sizes included in the type 5 line of the televue nagler are 31, and 16mm. An undercorrected eyepiece will have a longer effective focal length in red light, an overcorrected eyepiece a longer effective focal length in. Unfollow televue eyepiece to stop getting updates on your ebay feed. With this eyepiece you will gain a much wider view of the cosmos through your eyepiece 82 degrees worth. It is so named because it is usually the lens that is closest to the eye when someone looks through the device. Over the years, ive heard many interesting stories on the origin of the nagler eyepiece, especially on internet forums, so i thought id set down what ive discussed at many convention talks worldwide.
The nagler eyepiece design has evolved over the years with the result that nagler type 4, 5 and 6 are the current versions. Proceeds from the sale will benefit stellafane, the oldest and most revered star party in north america. The names televue and al nagler are synonymous among the international astronomy community and increasingly with the birding community with revolutionary telescope and eyepiece designs in production since 1977, and with the introduction of the first truly fast production aplanat and apochromat 70mm to 140mm aperture refracting telescopes for photo visual applications in birding, panoramic observing, and astronomy. To achieve the full magnification range over 82 apparent field of view requires two types. Invented by albert nagler and patented in 1979, the nagler eyepiece is a design optimized for astronomical telescopes to give an ultrawide field of view 82 that has good correction for astigmatism and other aberrations. Owners of fast dobsoniannewtonians can enjoy a larger true field, free of secondary shadowing, than ever before. The nagler type 5 is an example of a scaled design, meaning each eyepiece has the same components that simply scale up or down with the focal length. With naglers, my aim is to approach the wide angle perspective of naked eye vision, while maintaining the highest degree of sharpness, contrast, and viewing comfort.
Tele vue 2 nagler type 5 eyepiece 26mm astronomyconnect. Nagler type 5 eyepieces are designed for the purpose of allowing the biggest possible true field for an eyepiece with an 82 degree apparent field of view. An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes. The manufacturers listed at any given time during your search refinement offer at least one product that matches other search criteria you have already chosen. A little history been after that perfect set that really doesnt exist for long fl refractors and newts at f4. The astronomy help center choosing your eyepieces by al. To calculate the magnification of an eyepiece in your telescope, divide the focal length of the telescope by the focal length of the eyepiece. The 7element, nagler type 6 design is based on the original patented nagler design. Make offer new gso 2 30mm wide field 68deg fully multicoated telescope eyepiece rs instruments westminster, model a15, orion sirius plossl 6.
Nagler type5 with focal lengths of 31, 26, 20, 16mm and nagler type6 with focal lengths of , 11, 9, 7, 5, 3. Even today, i must admit a little discomfort when talking about nagler eyepieces. Nagler mythos in 2004, cloudy nights editor tom trusock took a deep dive into the entire nagler eyepiece line. I know this is an expensive eyepiece, but if you get it, you really only need a widefield eyepiece to compliment it. Looking through a nagler eyepiece is like taking a spacewalk. The eye relief also scale proportionately to the foacla length. The tele vue 26mm type 5 nagler eyepiece is a somewhat smaller, lighter and more powerful version of the celebrated 31 nagler type 5. It is parfocal with the 17mm nagler type 4, making it a nice match in size, weight, and convenience. The new 5mm nagler type 6 eyepiece is a significant improvement over the older 4. One is a prototype of the mm nagler ultrawidefield eyepiece, which transformed deepsky observing in the 1980s. If you are looking for a high end, best that money can buy eyepiece, in the 5mm range, and demand that nagler space walk experience, then i fully expect that this is the eyepiece that you will end up getting. This new 9mm nagler proves there is no need to sacrifice field in order to gain sharpness and power. Boasting a unique 6element design using four exotic glasses, the 31mm nagler type 5 preserves the contrast enhancement achieved by the type 4 while offering a true field area 82% larger than.
This old timer provides about the maximum magnification that my 60mm refractor and. This new 7element design update for the short focal length nagler deserves its own designation. Nagler felt confident so that in 1980 televue formally announced the mind blower mm nagler eyepiece. Televue nagler nagler eyepieces 82 degree apparent field. Tele vue 5 mm nagler type 6 eyepiece with free case en6050. Get the best deals on tele vue telescope eyepiece and lens naglers when you shop the. From then on tele vue has always sought ways to obtain the largest possible true fields i. Tele vue telescope eyepiece and lens naglers for sale in. Telescope eyepieces are made in different models and sizes to accommodate different observing methods and celestial objects. Thats because the 82 apparent field of view seems almost boundless. This one is for you people with a large eyepiece collection, maybe you own these two. Its projected by the eyepiece so that it appears as a circle out in space when you look through the eyepiece.
My first nagler and i can hardly wait to try it out. The angular diameter of this circle is called the apparent field of view afov and. The objective lens or mirror collects light and brings it to focus creating an image. The 31mm is intended for widefield use and not highmagnification observing of things like planets you can purchase smaller eyepieces with higher magnification from the nagler line as well if you wishi bought the 7mm for example. Televue nagler type 2 20mm expensive, even used, but worth it if you must have one of the best. Please read our privacy policy to learn how this information is collected, used, and how you can control it. The type5 permits the largest true field possible 31mm has 42mm field stop, while the shorter focal length type6. In the late 70s i designed an eyepiece sufficiently radical that i dared attach my name to it.
Introduced in 2007, the ethos is an enhanced ultrawide field design developed principally by paul dellechiaie under. Nagler type5 with focal lengths of 31, 16mm and nagler type6 with focal lengths of, 11, 9, 7, 5, 3. The nagler types 1, 2 and 3 have been discontinued. With the televue type 5 nagler 31mm eyepiece, the unique 6element type 5 design using four exotic glasses maintains the contrast advancement of the type 4s while achieving a true field area 82% larger than the 22mm type 4. When designing the naglers, the aim was to approach the wide angle perspective of naked eye vision, while maintaining the highest degree of.
The other half of the equation is the specifications of the eyepiece. In the late 1970s al nagler designed an eyepiece sufficiently radical that he dared attach his name to it. Views are tack sharp from edge to edge and the apparent field of view is spectacular. Its a must read for anyone who wants insight into his approach to creating eyepieces. A hand drawn performance comparison of spot sizes across the field drawn by mr. You may know theres a long history of naming eyepieces after their designers. The field stop is the metal ring inside the eyepiece barrel that limits the field size. Introduced in 2007, the ethos is an enhanced ultrawide field design developed principally by paul dellechiaie under albert naglers guidance at tele vue optics and claims a 100110 afov. Televue 7mm nagler type 6 eyepiece at left next to original design 7mm nagler eyepiece. The eye relief is so short that you have to practically place your eye on the lens to appreciate its wide field of view. The type5 permits the largest true field possible 31mm has 42mm field stop. It is parfocal with the 17mm nagler type 4, making it a nice match in size, weigh,t and convenience.
Televue nagler type 6 5mm i too have moved away from the heavier and larger televue eyepieces to the newer small and light televues type 5s and type 6s. Compares very well to the rest of the older nagler line i havent used any of the new ones yet and is better for eye relief than the other type 2 naglers. The eyepiece is placed near the focal point of the objective to. The exquisite sharpness, contrast, and comfort in addition to the monster afov make naglers the eyepieces of choice for advanced amateur and.
The evolution of eyepiece developments at tele vue. The goal is to allow the telescope to virtually disappear, leaving the impact of spacewalk viewing. Each and every one of these new eyepieces afford the very best in contrast and sharpness of any televue eyepiece type imho. In the late 1970s, al nagler designed an eyepiece so radical that he dared attach his name to it. Based on the original nagler design, the 7element4group lens configuration employed in the tele vue nagler type6 3. One is a prototype of the mm nagler eyepiece, which transformed deepsky observing in the 1980s. It has now been 20 years since tele vue designed the original mm nagler eyepiece. Proceeds from the sale will benefit stellafane, the oldest and. Svbony eyepieces 4mm telescopes lens wide angle 62 degree aspheric eyepiece hd fully coated lens for 1.
The nagler 4 line features clickstop adjustable barrels, roughly 17mm eye relief, and less pincushion distortion which makes straight objects look bent towards the edge of field, but is not. Tele vue 31 mm nagler type 5 eyepiece this is the 31 mm focal length nagler design eyepiece from tele vue, with the 82 apparent field of view, and amazing optical quality you expect from tele vue. Jun 26, 2007 one is a prototype of the mm nagler eyepiece, which transformed deepsky observing in the 1980s. I dont know how al nagler did it, but i suspect that at least 1 of the 3 pounds of this eyepiece is from the weight of pixie dust.
The specifications of a telescope are not the only specs that matter. Nagler i 40nagler ii 40meade uwa 40 what are the best designs. Tele vue 31mm nagler 2 telescope eyepiece with 82 degrees. Choosing your eyepieces by al nagler camera concepts. Single lens eyepieces the keplerian 18the herschelian 18the wollaston 18the coddington 18the tolles 19. I suspect i just need to correct my observing technic, but i want to confirm if you see the same just to rule out a possible faulty ep. The televue 20mm nagler type 5 is a poular medium power with owners of larger dobsonians and schmidtcassegrains. Lunar and planetary eyepieces with field to spare, the 7element, nagler type 6 designs are based on the original patented nagler design. Lessons learned from the ethos series brings you nagler. Eyepiece types in order of origin i iv preface 3 foreward 4 introduction 9 properties of an astronomical eyepiece 9 properties when used with a telescope objective 15 17 eyepiece designs.