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Agena 1.25" Starguider Dual ED Eyepiece - 15mm

4.8 4.8 out of 5 stars 13 ratings
$80.50
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Purchase options and add-ons

Brand Agena AstroProducts
Eye Piece Lens Description Plossl
Focus Type Manual Focus
Finderscope Reflex
Item Weight 6 Ounces
Lens Coating Description Multi-Coated
Focal Length Description 15 millimeters

About this item

  • The Agena StarGuider Dual ED eyepieces feature high contrast, 2 element ED glass
  • Wide 60 degree Field of View (FOV) in 5mm to 25mm focal lengths
  • Exceptional at nearly eliminating lateral color aberration and light scatter while retaining excellent sharpness, contrast and definition
  • Perform as well as other, more expensive Orthoscopic and Plossl eyepieces

Additional Details

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Agena 1.25" Starguider Dual ED Eyepiece - 5mm
Agena 1.25" Starguider Dual ED Eyepiece - 5mm
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Price$80.50$34.44$999.99$80.50$49.99$80.50
Delivery
Get it May 20 - 23
Get it May 20 - 23
Get it as soon as Thursday, May 16
Get it May 20 - 23
Get it as soon as Thursday, May 16
Get it May 20 - 23
Customer Ratings
4.84.8 out of 5 stars13
5.05.0 out of 5 stars3
4.94.9 out of 5 stars22
4.54.5 out of 5 stars19
4.54.5 out of 5 stars1,015
4.84.8 out of 5 stars14
Sold By
Agena Astro
Agena Astro
EXPLORE SCIENTIFIC
Agena Astro
SVBONY Direct
Agena Astro
focal length
15 millimeters
15 millimeters
—
—
21 millimeters
—
focus type
Manual Focus
—
Manual Focus
—
Manual Focus
Manual Focus
eye piece lens
Plossl
Plossl
—
Plossl
Plossl
Plossl
objective lens diameter
—
15 millimeters
25 millimeters
—
21 millimeters
1.25 inches
lens coating
Multi-Coated
Fully Multi-Coated
Fully Multi-Coated
Multi-Coated
Fully Multi-Coated
Multi-Coated
weight
6 ounces
3.1 ounces
41.5 ounces
6 ounces
230 grams
7 ounces
finderscope
Reflex
Reflex
Reflex
Reflex
Reflex
Reflex

Product Description

Agena's StarGuider Dual ED eyepieces are long eye relief eyepieces with a comfortably wide field for planetary observing that also give the sharpness, high contrast, and lack of lateral color and light scatter of the finest orthoscopic and Plossl designs. These can be used in any astronomical telescope that can accept standard 1.25" eyepieces.

Unlike many more expensive eyepieces for planetary observing, the Starguider Dual ED 15mm eyepiece maintains an excellent eye relief of 20mm. With sixlens elements in this unique design, this eyepiece is fully internally baffled and all internal spacers have antireflection microbaffles on their edges with flat black anodizing to reduce reflections when viewing the Moon and bright planets. Every air to glass surface is broadband multi-coated for peak light transmission and outstanding contrast on subtle lunar and planetary detail. 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 axis.

The eyepiece has a twist-up eyecup that can be raised or lowered to provide the eye relief you find most comfortable. This eyepiece is parfocal with other focal lengths in this series, minimizing the amount of refocusing needed when switching from eyepiece to eyepiece. It is threaded to accept standard 1.25" astronomy filters and weighs approx. 6oz. Note that the color of the trim on the eyepiece may change at any time and may not exactly match the color depicted above.

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Agena 1.25" Starguider Dual ED Eyepiece - 15mm

Agena 1.25" Starguider Dual ED Eyepiece - 15mm

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Customer reviews

4.8 out of 5 stars
4.8 out of 5
13 global ratings

Top reviews from the United States

bass player 61
5.0 out of 5 stars Great bang for the buck!
Reviewed in the United States on January 10, 2016
Verified Purchase
Looking for a great eyepiece at a great price? Look no further. I've owned over a dozen different telescopes in the 40 yrs I've been in the hobby of astronomy, and have tried many different brands of eyepieces, too. From the very expensive ones with green lettering to the generic budget offerings, and many in between. With the Starguider, I have found the nearly-perfect combination of quality and price.

Flat field across the view, this is a gem. The views are crisp and clear, and the 60° FOV is plenty wide enough for this observer. I selected the 15mm, which gives me 100x in my main scope (a 127 Maksutov-Cassegrain), and based on its performance splitting double star and observing star clusters and nebulae, I will be looking to add additional members of this line to my collection, specifically the 8mm and the 25mm.

Bottom line...no need to spend hundreds on a single eyepiece when these are available for $60-$70 each. Perhaps in a 'fast' scope (f/5 or faster) they will show more shortcomings, but for a longer focal length scope such as f/8 or higher, these will definitely do the job, and do it very well.
7 people found this helpful
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CFSO
5.0 out of 5 stars Best purchase so far for this beginner
Reviewed in the United States on September 7, 2022
Verified Purchase
Quality eyepiece that wowed even the experienced members of our astronomy club.
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R. Stephen Franks
5.0 out of 5 stars A "dark horse" eyepiece deserving of the hightest praise
Reviewed in the United States on October 21, 2015
Greetings,

I spent a good amount of time and research looking for a new, high quality set of eyepieces to replace my older sets from the 1980s. I wanted a first-class, "general purpose" eyepiece set that offered a wide field for DSOs (deep sky objects) and high contrast, well-corrected images for planetary and binary star observing. It was a difficult demand to fill at any price.

After months researching optics, I had pretty much settled on a lesser known 5-element design by a Dr. Masuyama. Basically, a refined Plössl or symmetrical eyepiece design with a fifth element interposed between the two doublet lenses. Restricting the number of lens elements is highly desirable in keeping light loss and lens scatter to an absolute minimum for planetary observations, while keeping the design at an economical price. Multi-element, wide field oculars (like Naglers) were specifically designed and corrected for fast f/4.5 ratio Dobsonians. But they are large, heavy, dreadfully expensive and optical overkill. That is to say, over-corrected for more moderate f/ratio Newtonians, slow Catadioptrics, well-corrected apochromats and f/8 to f/15 classical achromatic refracting telescopes.

While I found the Dr. Masuyama design (Parks Gold oculars) indeed had superb optics for planetary and binary star work, their 52° fields of view were not much of an improvement over my older 42° Vernonscope Brandon and Unitron orthoscopic oculars. I wanted a less constricted view for DSOs in an effort to enjoy a one "general purpose" eyepiece design of exceptional qualities.

It was then that I stumbled onto the Agena Dual ED Starguiders. This 5 & 6-element eyepiece immediately impressed me with its first-class fit and finish, weight and design. Its out-of-the-box quality promised good things to come at the eyepiece and it did not fail.

Testing the Agena Dual ED 8mm against an 8mm Vernonscope Brandon ($235) and a 7mm Parks Gold ($140) under the severest binary star tests with a Celestron 6" AVX refractor, the Agena proved to be of equal optical performance with the bonus of a much greater 60° apparent field of view. The Agena 60° field is wide enough for impressive deep-sky observations, and imposing lunar landscapes. The optical quality of the Agena meets all of my observational requirements whatever the astronomical target. Globular clusters are well-defined with stars sharply resolved to the core even at 8mm and 6mm. Orion's Nebula displays wispy tendrils and a wonderful, ghostly 3-D appearance, while its Trapezium E and F stars are easily snared. The most delicate binaries are readily detected. Saturnian moons that might, otherwise, be lost in light scatter are easily detected in a black sky.

To quote an optician's review of the Agena Dual ED design:
"Each Starguider 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 Starguider eyepiece is fully multi-coated 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 nebulae against a truly dark sky background. The lens edges are blackened to eliminate internal reflections and further improve contrast."

As serious observer of 37 years and a hardcore refractor owner, I demand the best in optics. Agena's Starguider Dual ED eyepieces are truly a "dark horse" ocular design that deserves the highest praise. You will NOT regret owning a set of Agena Dual ED eyepieces. This is an outstanding high resolution design at a very affordable price.

Steve Franks
10 people found this helpful
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Robert Ballard
5.0 out of 5 stars Excellent
Reviewed in the United States on July 10, 2016
I carefully compared this to the 2 inch 26mm Garrett (Oberwerk) eyepiece and found the Agena to be slightly ahead in contrast and flat field.
I am keeping the Agena and letting the Garrett go. The difference in field size (70 for the Garrett, 60 for the Agena) was marginal to me.
The slight advantage in contrast and flatter star images made the difference. The price is great for the quality and the view.
5 people found this helpful
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