APO, Calgary, Alberta

The newest William Optics Ultra Wide Angle eyepieces.

It perfectly fits the description of "a great premium eyepiece at a unbeatable price".
You will never part with it, and it will give you great low-power views of our galaxy for many nights.

SUPER WIDE FOV

• Outstanding ultra-wide field of view: 82 degrees
• Fully multi-coated lenses for excellent light transmission.
• Reduced chromatic aberration.
• Improved contrast compared to similar eyepieces.

GREAT CONTRAST
• Internally fully blackened (lenses’ edges and internal spacers)
• No flaring or ghosting on high-contrast objects
• Parfocal

WELL DESIGNED
• Innovative twist-up rubber eyecup.

• Long eye-relief: 18mm.
• No internal reflections, kidney beaning or other distracting distortions.

TERRIFIC FIT AND FINISH
• Highly-resistant anodized black barrel.
• Smooth design for no hook up in your focuser.
• Threaded for 2" filters.

An unbelievable performer at an attractive price.
Exclusively from William Optics.

                            Buy a UWAN 28mm eyepiece at $376
              Get any additional 1.25" UWAN eyepieces at discounted prices.

                UWAN 16mm $185      UWAN 7mm $180      UWAN 4mm $180

Fantastic 1.25" 82 degree FOV eyepiece.
Ideal for rich-field views at moderate power.
This eyepiece is ready to become one of your favorites.

ULTRA WIDE FOV
• Outstanding ultra-wide field of view at 82 degrees.
• Fully multi-coated lenses for excellent light transmission.
• Reduced chromatic aberration compared to similar design eyepieces.

GREAT CONTRAST
• Internally fully blackened (lenses’ edges and internal spacers)
• No flaring or ghosting on high-contrast objects
• Parfocal
• Good contrast & brightness.

WELL DESIGNED
• Long eye-relief: 12mm

• No internal reflections, kidney beaning or other distracting distortions.

TERRIFIC FIT AND FINISH
• Highly resistant anodized black barrel.
• Smooth design for no hook up in your focuser.
• Threaded for filters.

Did we mention the ultra competitive pricing?
(Compared to other 16mm 82 degree eyepieces)

Open up the universe in your telescope at an incredible price!

Beautiful Ultra Wide Angle (UWA) eyepiece, for beautiful observation sessions with your telescope. This 7-element UWAN eyepiece is ideal for rich-field observations at medium-high power.

SUPER WIDE FOV
• Outstanding super-wide field of view at 82 degrees.
• Fully multi-coated lenses for excellent light transmission.
• Reduced chromatic aberration.
• Improved contrast compared to similar eyepieces.

GREAT CONTRAST
• Internally fully blackened (lenses’ edges and internal spacers).
• No flaring or ghosting on high-contrast objects.
• Parfocal.

LIGHT AND EASY
• Innovative twist-up rubber eyecup.
• Long eye-relief: 12mm
• No internal reflections, kidney beaning or other distracting distortions.

TERRIFIC FIT AND FINISH
• Highly resistant anodized black barrel.
• Smooth design for no hook up in your focuser.
• Threaded for 1.25" filters.

The ultimate high power eyepiece for ultra wide field views! The UWAN 4mm will yield truly amazing views of our starry sky at a truly amazing price. Finished are the times when a quality eyepiece had to cost the earth!

SUPER WIDE FOV
• Outstanding ultra-wide eyepiece: 82 degree FOV.
• Fully Multi-Coated (FMC) glass for excellent light transmission.
• Reduced chromatic aberration, but still bright.
• Improved contrast compared to similar eyepieces.

GREAT CONTRAST
• Internally fully blackened (lenses’ edges and internal spacers).
• No flaring or ghosting on high-contrast objects.
• Parfocal.

LIGHT AND EASY
• Innovative twist-up rubber eyecup.

• Long eye-relief for its focal length: 12mm.
• No internal reflections, kidney beaning or other distracting distortions!

TERRIFIC FIT AND FINISH
• Highly resistant anodized black barrel.
• Smooth design for no hook up in your focuser.
• Threaded for your favorite 1.25" filters.

Now you have a choice: take it or regret it!

SWAN: A huge-lens rich-field eyepiece at a very reasonable price! Fully multicoated with an advanced design for breathtaking 72 degree jaw-dropping views. Internally baffled and all lenses' edges and internal spacers blackened. A treat to use. Try it out on the Milky Way!

A True Spacewalker
• Marvelous super-wide field of view. (72 degrees)
• Fully Multicoated lenses for excellent transmittance.
• Outstanding chromatic aberration correction.
• Sharp and well contrasted.

Great Contrast

• Internally fully blackened (lens edges and internal spacers).
• No flaring or ghosting on high-contrast objects.
• Parfocal.

Ease of Use
• Soft rubber eyecup.
• Extremely long eye-relief: (28mm)
• No internal reflections.

Terrific Fit and Finish

• High-resistance anodized black barrel.
• Smooth design for no hook up in your focuser.
• Threaded for 2” filters.

SWAN: A great all-around eyepiece that does not break your wallet! All lenses' edges and internal spacers blackened. Screw up type eye cup. Excellent definition and dark background. Internally baffled and blackened, fully multicoated, a breath-taking 72 degree field of view!

Impressive FOV
• Outstanding super-wide field of view. (72 degrees)
• Fully Multicoated lenses for excellent transmittance.
• Outstanding chromatic aberration correction.
• Excellent definition and dark background.

Great Contrast

• Internally fully blackened (lens edges and internal spacers).
• No flaring or ghosting on high-contrast objects.
• Parfocal.

Ease of Use
• Soft rubber eyecup.
• Extremely long eye-relief. (28mm)
• No internal reflections.

Terrific Fit and Finish

• High-resistance anodized black barrel.
• Smooth design for no hook up in your focuser.
• Threaded for 2” filters.

SWAN: With any telescope, this great all-around eyepiece will not let you down! The incredibly wide 72 degree FOV makes it perfect for low-power rich-field viewing. Internally baffled, all lenses' edges and internal spacers blackened and Fully multicoated (FMC). A great optical achievement!

Spectacular Images
• Outstanding super-wide field of view. (72 degrees)
• Fully Multicoated lenses for excellent Light transmission.
• Outstanding chromatic aberration correction.
• Sharp and well contrasted.

Great Contrast
• Internally fully blackened (lens edges and internal spacers).
• No internal reflections
• No flaring or ghosting on high-contrast objects.
• Parfocal.

Light and Easy
• Weighs only 330 grams.
• Soft rubber eyecup.

• Extremely long eye-relief. (25mm)
• No internal reflections

Terrific Fit and Finish
• High-resistance anodized black barrel.
• Smooth design for no hook up in your focuser.
• Threaded for 2” filters.

SWAN: The perfect compromise between quality, cost, eye-relief and edge sharpness. All with a super-wide 72 degree FOV! The ultimate 1.25" Super Wide Angle eyepiece. Internally baffled, all lenses' edges and internal spacers blackened and Fully multicoated (FMC). Try and compare!

Perfect match with William Optics telescopes
• Outstanding super-wide field of view. (72 degrees)
• Fully Multicoated lenses for excellent transmittance.
• Outstanding chromatic aberration correction.
• Excellent contrast and light throughput for sharp viewing.

Great Contrast

• Internally fully blackened (lens edges and internal spacers).
• No internal reflections.
• No flaring or ghosting on high-contrast objects.
• Parfocal.

Light and Easy
• Soft rubber eyecup
• Long eye-relief. (17mm)
• No internal reflections or kidney bean effect

Terrific Fit and Finish
• High-resistance anodized black barrel.
• Smooth design for no hook up in your focuser.
• Threaded for 1.25” filters.

SWAN: How many comparable EPs at this price? Internally baffled, all lenses' edges and internal spacers blackened and Fully multicoated (FMC). This 5-element super-wide angle EP’s panoramic views at 72 degree FOV will leave you speechless! Day and night!

Your Window on the Sky
• Outstanding super-wide field of view. (72 degrees)
• Fully Multicoated lenses for excellent transmittance.
• Reduced chromatic aberration.
• Improved sharpness and contrast throughout the field.

Impressive Performances

• Internally fully blackened (lens edges and internal spacers).
• No flaring or ghosting on high-contrast objects.
• Parfocal.

Comfortable
• Soft rubber eyecup.
• Long eye-relief. (14mm)
• No internal reflections, kidney beaning, pin-cushion or other distortions.

Terrific Fit and Finish

• High-resistance anodized black barrel.
• Smooth design for no hook up in your focuser.
• Threaded for filters’ usage.

SWAN: A premium eyepiece for your most demanding observations. Unforgettable views of star clusters and the moon at 72 degree FOV. Internally baffled, all lenses' edges and internal spacers blackened and Fully MultiCoated (FMC). A premium eyepiece at a fraction what it’s worth!

Super Wide FOV
• Outstanding super-wide field of view. (72 degrees)
• Fully Multicoated lenses for excellent transmittance.
• Reduced chromatic aberration.
• Improved contrast compared to similar EPs.

Great Contrast
• Internally fully blackened (lens edges and internal spacers).
• No flaring or ghosting on high-contrast objects.
• Parfocal.

Light and Easy
• Soft rubber eyecup.
• Long eye-relief. (12mm)
• No internal reflections, kidney beaning or other distracting distortions.

Terrific Fit and Finish
• High-resistance anodized black barrel.
• Smooth design for no hook up in your focuser.
• Threaded for filters’ usage.

                                      TITAN 38mm 2" Eyepiece

This 2" Astro-Tech 38mm Titan is a really big low power eyepiece with a super wide angle wide 70° field. It provides dramatic “picture window onto space" images with virtually any telescope that uses a 2" diagonal or focuser. For example, with an 8" f/10 catadioptric it will give you a wide 1.33° actual field (well over two and a half times the diameter of the full Moon) at 52.6x. With an 8" f/6 Dob, however, the 38mm Titan provides 32x, a very bright 6.33mm exit pupil, and a wide 2.19° field of view that’s well over four times wider than the full Moon. It takes an object nearly nine minutes to cross that very wide field, giving multiple observers plenty of time to take a look before you have to manually re-aim your scope. Please note the 24.8 ounce weight of this eyepiece if you have a Dobsonian scope. It may pose a balance problem with some Dobsonians when switching to the 38mm from a much lighter 1.25" eyepiece. Use of the 38mm Titan may require some temporary rebalancing of your scope. With a refractor like an 80mm f/6.8, the 38mm Titan provides a huge 4.84° field at 14.5x. That makes the scope its own best finderscope and ideal for very wide field views of galaxy clusters, the larger nebulas, open clusters, the star clouds in Sagittarius, and more.

The Titan’s 20mm eye relief provides unvignetted viewing for eyeglass wearers. You will find you have to move your head from side to side while observing to see the entire Cinemascope-type field. Protective dust covers are provided for both ends of the eyepiece. Astronomy Technologies provides a 2 year warranty.

        Parfocal • Blackened lens edges • Matte black internal barrels • Twist up eyecup • Rubber grip rings

                                                                       PART # ATT38      $100

                                              TITAN 32mm 2" Eyepiece

This Astro-Tech 32mm Titan is low power super wide angle 2" eyepiece with a very wide 70° field. It provides “picture window onto space" images with any telescope type. If you have a 2" diagonal or focuser, it will nearly double the area of the field of view that’s visible through a high quality 32mm Plössl eyepiece. For example, with an 8" f/10 catadioptric it will give you a wide 1.12° actual field (0.99 square degrees in area and well over twice the diameter of the full Moon) at 62.5x. This compares with the 0.8° actual field (0.5 square degrees in area) that you get at the same magnification with the 50° apparent field of a typical high grade 32mm Plössl. With an f/4.5 Dobsonian, however, it starts pushing the envelope of your eye’s abilities. With an 8" f/6 Dob the 32mm Titan provides 38x, a bright 5.33mm exit pupil, and a wide 1.84° field of view that’s over three times wider than the full Moon. It takes an object nearly seven and a half minutes to cross that wide field of view. Using an 80mm f/6.8 refractor, the 32mm Titan provides a huge 4.07° field at 17.2x. That makes it ideal for very wide field views of galaxy clusters, the larger nebulas, open clusters, and more.

Its 17mm eye relief will provide virtually unvignetted viewing for eyeglass wearers. Protective dust covers are provided for both ends of the eyepiece. Astronomy Technologies provides a 2 year warranty.

         Parfocal • Blackened lens edges • Matte black internal barrels • Twist up eyecup • Rubber grip rings

                                                                       PART # ATT32    $90

                                             TITAN 26mm 2" Eyepiece

The Astro-Tech 26mm Titan is medium power super wide angle 2" eyepiece with a very wide 70° field. It provides “picture window onto space" images with any telescope type. If you have a 2" diagonal or focuser, it will nearly double the area of the field of view visible through the 25mm or 26mm eyepiece that comes standard with most new telescopes. For example, with an 8" f/10 catadioptric it will give you a wide 0.91° actual field (0.65 square degrees in area) at 76.9x. This compares with the 0.65° actual field (0.33 square degrees in area) that you get at the same power with the typical 26mm Plössl supplied with most such scopes. With a 1143mm focal length 10" f/4.5 Dobsonian it provides 44x, a bright 5.8mm exit pupil, and a wide 1.6° field of view that’s over three times as wide as the Moon. It takes an object nearly six and a half minutes to cross that field of view. With a refractor like an 80mm f/6.8, the 26mm Titan provides a huge 3.3° field at 21.2x. That makes it ideal for very wide field views of galaxy clusters, the larger nebulas, open clusters, and more.

Its 13mm eye relief is quite reasonable for this focal length, although it can somewhat limit the field for eyeglass wearers. Protective dust covers are provided for both ends of the eyepiece. Astronomy Technologies provides a 2 year warranty.

       Parfocal • Blackened lens edges • Matte black internal barrels • Twist up eyecup • Rubber grip rings

                                                                     PART # ATT26    $80

                                       TITAN 20mm 1.25" Eyepiece

This Astro-Tech 20mm Titan is a very wide 70° field medium power 1.25" eyepiece. It will give you a wide 1.23° field and a bright 4.4mm exit pupil at 57x with a 10" f/4.5 Dobsonian. This will give you almost five minutes to observe an object as it drifts from one side of the eyepiece’s flat field to the other in such a scope. With a 400mm focal length 66mm refractor it provides 20x, a 3.3mm exit pupil, and a huge 3.5° field of view that’s seven times as wide as the Moon. Use this 20mm Titan on an 8" f/10 catadioptric scope and you still get a 0.7° field at 100x, perfect for the Moon and globular clusters like M9, M13, and M22. This eyepiece also makes it a very affordable choice to buy in pairs for binoviewer.

Its 11mm eye relief is quite reasonable for this focal length, although it can somewhat limit the field for eyeglass wearers. Protective dust covers are provided for both ends of the eyepiece. Astronomy Technologies provides a 2 year warranty.

     Parfocal • Blackened lens edges • Matte black internal barrels • Twist up eyecup • Rubber grip rings

                                                                        PART # ATT20     $70

TITAN 15mm 1.25" Eyepiece

The Astro-Tech 15mm Titan is a very wide 70° field medium power 1.25" eyepiece. It is ideal for lunar observing, resolving globular clusters, picking up detail in emission and reflection nebulas, etc. Its 15mm focal length nicely fills the gap between the 25/26mm eyepiece that typically comes as standard equipment with most telescopes and an 8/10mm high power planetary/binary star splitting eyepiece.

With short focal length refractors and fast focal ratio reflectors, it gives an extraordinary “picture window on space" image. An f/4 8" Schmidt-Newtonian reflector, for example, yields a 3.75mm exit pupil, 54x, and a generous 1.3° field of view that’s good for observing open clusters such as the Pleiades; large nebulas such as the Lagoon, Veil, and Orion; and large globulars such as M-13 and Omega Centauri. Globular clusters and nebulas are vivid and nearly three-dimensional. A 66mm f/6 refractor has a magnification of 27x with this eyepiece, with a 2.5mm exit pupil and an immense 2.63° field (over five times as wide as the full Moon). Use this 15mm Titan on an 8" f/10 catadioptric scope and you still get a 0.52° field at 133x, perfect for the Moon and globular clusters like M9, M13, and M22.

The 7mm eye relief is somewhat short for those who must wear eyeglasses while observing due to astigmatism, and will somewhat vignette the field. This is of minor concern, as even those who don’t have to wear glasses while observing will find they have to move their head from side to side while observing to see the entire huge field of view. Protective dust covers are provided for both ends of the eyepiece. Astronomy Technologies provides a 2 year warranty.

Parfocal • Blackened lens edges • Matte black internal barrels • Twist up eyecup • Rubber grip rings

                                    TITAN 10mm 1.25" Eyepiece

This Astro-Tech 10mm Titan is a very wide 70° field medium to medium-high power 1.25" eyepiece at a very economical price. Its 10mm focal length makes it a good choice for high power lunar/planetary observing and binary star splitting with a long focal length telescope. With an 8" f/10 catadioptric, it provides 200x with a 1mm exit pupil, the optimum exit pupil generally recommended to best match the resolution of your telescope to the resolution of your eye. The field of view with such an 8" f/10 scope is a surprising 0.35° at 200x, nearly three-quarters the lunar diameter. A f/4 8" Schmidt-Newtonian reflector yields a 2.5mm exit pupil, 81x, and a generous 0.86° field of view that’s perfect for globular clusters like M9, M13, and M22. A 66mm f/6 refractor has a magnification of 40x with this eyepiece, with a 1.66mm exit pupil and a generous 1.75° field (three and a half times as wide as the full Moon). That wide field is good for observing open clusters such as the Pleiades and the Double Cluster in Perseus; large nebulas such as the Lagoon, Veil, and Orion; and large globulars such as M-13 and Omega Centauri.

The 7mm eye relief is somewhat short for those who must wear eyeglasses while observing due to astigmatism, and will somewhat vignette the field. This is of minor concern, as even those who don’t have to wear glasses while observing will find they have to move their head from side to side while observing to see the entire huge field of view. Protective dust covers are provided for both ends of the eyepiece. Astronomy Technologies provides a 2 year warranty.

                    Parfocal • Blackened lens edges • Matte black internal barrels • Twist up eyecup

                                                                        PART # ATT10    $60

PARADIGM Dual ED Eyepieces

These new Astro-Tech Paradigm Dual ED lens eyepieces use a six-lens optical system with two ED elements in a design that is quite unique. The new Paradigm Dual ED eyepieces are not simply a repackaging under a different brand name of an existing ED eyepiece line (some of which have been on the market for over 15 years). Instead, the Paradigm Dual ED optical design is totally new and unique to the Astro-Tech Paradigm eyepieces. The six lens/four group optical layout can be seen in schematic.

Each Paradigm uses two separate ED (Extra-low Dispersion) glass elements of different glass types in its optical system to provide exceptional color fidelity (with vanishingly low levels of chromatic aberration) so that the true color differences between binary star pairs and planetary surface details are easily visible. Their 60° field of view is very flat, particularly with telescopes f/5 and above in focal ratio. They are uniformly sharp edge-to-edge, with markedly low astigmatism. Barrel distortion is essentially non-existent, eliminating the annoying “goldfish bowl” distortion of the image seen in some eyepieces when panning across a star field.

Each air-to-glass surface in a Paradigm eyepiece is fully multicoated for high light transmission and exceptional contrast. The high contrast makes them a good choice for splitting close binary stars, for examining low contrast lunar and planetary detail, and for ferreting out small and faint planetary nebulas against a truly dark sky background. The lens edges are blackened to eliminate internal reflections and further improve contrast.

Their chrome barrels are threaded for standard 1.25” filters, and a shallow safety groove is machined into each barrel. This groove engages the thumbscrew or compression ring of your focuser or star diagonal to prevent the eyepiece from falling should the thumbscrew loosen accidentally during use. The Paradigms are parfocal, minimizing the amount of refocusing needed when switching from a low power eyepiece to a higher power within the series.

Their very well-made and substantial bodies are clad in shock-absorbing rubber, with nine scalloped grooves around the circumference to provide a secure grip in all temperatures. The soft rubber eyecup incorporates an internal twist-up design that lets you smoothly raise and lower the Paradigm eyecup to precisely match the eye relief to your eyesight. The eye lenses are large in diameter, making it easy to comfortably center your eye on the exit pupil. At 13mm to 15mm, the usable eye relief allows for comfortable eyeglass use,

Although Astronomy Technologies is making these eyepieces available for the first time, they still come with a 2 year warranty. Paradigm Dual ED eyepieces will make you rethink your expectations about how much sheer eyepiece excellence you can get for such a reasonable price.

25mm 1.25" Paradigm Dual ED
• Medium to low power eyepiece
• Six lens (two ED) four group design
• 60° field of view
• 15mm eye relief
• 181.43 grams (6.4 oz)

PART # ATPARA25

18mm 1.25" Paradigm Dual ED
• Medium to medium low power eyepiece
• Six lens (two ED) four group design
• 60° field of view
• 13mm eye relief
• 158.75 grams (5.6 oz)

PART # ATPARA18

15mm 1.25" Paradigm Dual ED
• Medium power eyepiece
• Six lens (two ED) four group design
• 60° field of view
• 15mm eye relief
• 181.43 grams (6.4 oz)

PART # ATPARA15

12mm 1.25" Paradigm Dual ED
• Medium low power eyepiece
• Six lens (two ED) four group design
• 60° field of view
• 13mm eye relief
• 181.43 grams (6.4 oz)

8mm 1.25" Paradigm Dual ED
• Medium power eyepiece
• Six lens (two ED) four group design
• 60° field of view
• 13mm eye relief
• 181.43 grams (6.4 oz)

5mm 1.25" Paradigm Dual ED
• Medium to medium high power eyepiece
• Six lens (two ED) four group design
• 60° field of view
• 13mm eye relief
• 204.12 grams (7.2 oz)

Model	SPL 3	SPL 6	SPL 12.5
Focal Length	3mm	6mm	12.5mm
Lens Structure (#Elements/#Groups)	7/4	7/4	7/4
Field of View	55°	55°	55°
Eye Relief	20mm	20mm	20mm
Coating	FMC	FMC	FMC
Barrel Size	1.25"	1.25"	1.25"
Parfocal	Yes	Yes	Yes
Weight	200 grams	150 grams	150 grams

SPL 1.25" Eyepieces

Alberta Premium Optics is proud to introduce the new William Optics SPL (Super Planetary Long eye-relief) eyepieces. This new Planetary Eyepiece series is designed for users with needs of a high-power, sharp and high contrast views for planetary observations. The long eye relief is a bonus for people with eyeglasses and for people who do not want to strain their eyesight during observation sessions.

High Quality Optical Lens
• Special glasses and perfect multi-coatings make the optical performance of SPL amazing in almost any telescope.
• A well corrected field of view, free from optical aberrations, allows you to finally enjoy planets as they deserve to be.
• Good transmittance and excellent color rendition will allow you to enjoy planetary details you had missed so far.
• Leave ghosting and flares to other eyepieces: your William Optics SPL will not disappoint you.

High Power and High Contrast
• Available in three focal lengths, 3mm, 6mm, and 12.5mm, these eyepieces will satisfy any power requirement.
• Easy to Barlow, they will yield amazing results even at the highest powers.
(provided that atmospherical conditions and your telescope can hold such high powers!)
• Great contrast and sharp to the edge.
• Distortion-free EXTRA details is not a miracle: it all goes down to quality construction and design.

Long Eye Relief
• All three focal lengths boast very long eye relief for maximum view comfort even for eyeglass wearers.
• Mechanically beautiful and functional tapered barrel.
• Blackened lenses edges and flat black paint in the barrel to minimize sources of potential reflections.

Excellent Value
• The price of these planetary eyepieces will encourage you to get the whole series to add to your keeper eyepieces!
• SPL eyepieces will give you just what you always wanted.

                                          Part # 2120 WE-SPL3                  ~~$139~~       $105 SALE
                                          Part # 2121 WE-SPL6                  ~~$139~~       $105 SALE
                                          Part # 2119 WE-SPL12.5            ~~$139~~       $105 SALE

The TMB Optical® eyepieces are long eye relief eyepieces with a comfortably wide field that have the sharpness, contrast, and lack of lateral color and light scatter for planetary observing of the best orthoscopic and Plössl designs. What they don’t have is the ortho and Plössl’s limited eye relief and restricted fields. The six-element TMB Optical® eyepieces provide a substantial 58° field of view with high contrast, a tack sharp view, and surprisingly long eye relief for relatively unvignetted eyeglass use.

The TMB Optical® eyepieces are fully internally baffled and all internal spacers have antireflection microbaffles on their edges and full flat black anodizing to reduce reflections. The field stop likewise has microbaffles in its edge to reduce off-axis flaring. Every air to glass surface is broadband multicoated for peak light transmission and superb contrast on subtle lunar and planetary detail. Each has a flexible rubber fold-down eyeguard on top of a twist-up eyecup that can be raised or lowered to match precisely the eye relief you find most comfortable. The eye lens is very large, at a 22mm diameter, which many people find more user-friendly than the narrow diameter lens of most short focal length eyepieces. Spherical aberration of the exit pupil is well controlled, so there are no serious blackouts or kidney-bean effects if you move your eye slightly off the eyepiece sweet spot, as you find with many other wide field eyepiece types. Dust covers are provided for both ends of each eyepiece. A safety groove is machined into the black barrel to engage your focuser thumbscrew to prevent the eyepiece from falling should the thumbscrew accidentally loosen while observing.

Tested against such stellar planetary eyepieces as the legendary TMB Super Monocentrics and the Zeiss Abbe orthos, the TMB Optical® designs were equal in sharpness to these 5-6 times more expensive eyepieces, with wider fields and longer eye relief, and virtually their equal in the amount of light scatter – truly amazing, considering the low price of the TMB Optical® eyepieces.

Production of TMB Optical® Planetary Eyepieces has been officially authorized by the estate of the late Thomas M. Back.

A new William Optics high-quality zoom eyepiece with a large field of view and very good correction.
No more compromises for zoom eyepieces!

Spectacular Images
• Zoom from 22.5mm to 7.5mm by simply rotating the body of the eyepiece.
• Fully Multicoated lenses for excellent transmittance
• Reduced chromatic aberration.

Great Contrast
• Internally fully blackened (lens edges and internal spacers).
• Adjustable push-up eyecup, UWAN style.
• No flaring or ghosting on high-contrast objects.

Terrific Fit and Finish
• Threaded for filter usage.
• Smooth design for no hook up in your focuser.

Experience the convenience of 5 eyepieces in one, at the price of half!

These are the same 66° eyepieces that come in the William Optics Binoviewer Package.
A great way to start your binoviewing experience, without breaking the bank!

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Last modified: 06/26/09

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Last modified: 06/26/09

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