Baader 21mm Hyperion Modular Eyepiece - 1.25"/ 2"

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Baader 21mm Hyperion Modular Eyepiece - 1.25"/ 2"

Baader Planetarium's Hyperion Modular Eyepieces are some of the finest available amateur wide field of view eyepieces in the world. Built for efficiency and quality to provide a high-end and world-class level of performance to the amateur astronomers of the world, the Hyperion eyepieces have been designed for optimal transmission, contrast, and clarity. By utilizing the best available optical coatings and a superb mechanical design Baader has produced a low cost eyepiece that operates on an entirely different level from competition at a similar price point. A prime quality of these splendid eyepieces is their modular and multi-functional nature. Designed to be usable with a wide variety of telescopes, these eyepieces can be inserted into both 1.25" and 2" compatible focusers. These eyepieces have also taken comfort into consideration, and have been ergonomically constructed with long astronomy sessions in mind from the start with features such as an integrated eye guard and 20mm of eye relief.


Dust Caps IncludedYes
ER20mm or More
Eye Guard IncludedYes
Eye Relief20mm
Eyepiece OpticsHyperion Modular
Field of View68 degrees
Focal Length21mm
FoV 79 Degrees
Free ShippingYes
Lens Elements & Groups8 elements & 5 groups
ModelBaader Hyperion
Warranty1 Year Warranty
Customer Reviews
5.0 Based on 5 Reviews
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joseph c.
United States United States
21mm Baader eyepiece

Excellent addition to my eyepieces; I have 2 Orion Stratus eyepieces 5mm and 13mm and a 30mm; this one fills the magnitude gap nicely and is of great quality

Mark S.
United States
Baader 21mm

Parfocal with Baader 36mm. Nice wide field.

mike a.
21mm Hyperion

Excellent- finely constructed. Beautiful crisp views in mt 8 Celestron SC. The price is a winner! OPT is a great dealership! Mike Anderer Saint Charles, Il

Felipe O.
Excellent low power with medium/long scopes

I currently own the 5, 8, 13 and 21 mm models (and saving for the 36 mm. I use them in my 3 small (typical urban observer telescopes: Meade ETX 90 mm f/14, and Bushnell 127 mm f/12 Maksutovs, and 80 mm f/5 short-tube doublet refractor (***** A80-SSWT. The Hyperions look and feel big on these small scopes, but that's just about it, you can very easily get to using them without problems of handling or balancing. Optically, they do great, very honestly delivering the wide field and ample eye relief stated in the specs, and all with very good illumination and contrast. The only optical drawback is some evident, but reasonably expected and tolerable, edge distorsion when using the 13 and 21 mm in the f/5 short-tube. This is manifested by coma and spherical distortion in the outer surroundings of the viewfield, noticeable starting from around 2/3 out of the center while in the larger central region, the image is still quite excellent. I have done Moon, planets, star fields, and brighter fuzzies with the Hyperions all of it very satisfying observing. I can only imagine how they deliver in larger scopes or darker skies, but my humble experience with my urban lot of small scopes tells me these eyepieces should do very fine indeed. If buying a small basic set of Hyperions, I may suggest geting the 13, 8, and 21 or 24 mm (in that order as perhaps the most generally useful with any scope. As for myself, I tend to use 21 and 8 mm with the Maks, 13 and 5 mm in the f/5. The 5 mm gets too dim and washed out (over-magnified in the Maks while the 21 mm gives too much urban sky glow, besides edge distortion, in the short-tube.

Great Alternative!

I own the 21mm, 13mm, 8mm Baader Hyperion’s and couldn’t be more satisfied! I have done side by side comparisons with eyepieces 2-3 times there cost and the Hyperion’s have nearly matched, matched and exceeded the views of the others especially in contrast. Why use $400-$600 eyepieces for public viewings and cringe when the sticky fingered child or makeup queen are next inline to view? My Nagler’s are still #1 but the Hyperion’s make a great alternative!