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

Parfocal with Baader 36mm. Nice wide field.

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

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.

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!