At a Glance
17mm
Focal Length
68°
Apparent FOV
17mm
Eye Relief
1.25"
Barrel Size
Score Breakdown
Overview
The Baader Hyperion 17mm is a well-regarded eyepiece that delivers a 68-degree apparent field of view, making it a solid choice for deep-sky observers who want expansive, immersive views of nebulae, star clusters, and the lunar surface. The fully broadband multi-coated optics (Baader's Phantom Group coating) do a credible job of maximizing light transmission and keeping contrast high, which matters when you are chasing faint objects under dark skies. The 20mm eye relief is one of its more practical strengths.
Eyeglass wearers will find they can take in the full field without pressing their face against the eyepiece, which becomes important during long sessions. The 1.25-inch barrel fits the vast majority of amateur telescopes, and the dual filter threads (M28.5 and M48) add genuine versatility for those who use narrowband or light pollution filters. Where the Hyperion earns particular respect is its modular design, which allows you to reconfigure it with other Baader components for photography or different focal length combinations.
At $217, it sits in a competitive bracket. It is not a budget eyepiece, but the optical quality and build justify the price for observers ready to move beyond entry-level glass.
Key Features
- 68-degree apparent field of view delivers genuinely wide, immersive views suitable for deep-sky objects and lunar observation
- Phantom Group broadband multi-coatings improve contrast and light throughput compared to standard coatings
- 20mm eye relief makes comfortable viewing realistic for eyeglass wearers during extended sessions
- Dual filter threads (M28.5 and M48) allow direct attachment of most standard astronomy filters without adapters
- Modular design is compatible with other Baader Hyperion components, useful for astrophotography configurations
- 1.25-inch barrel ensures broad compatibility across most amateur telescopes on the market
- Build quality and optical consistency are notably better than similarly priced generic alternatives
Specifications
| Focal Length | 17mm |
| Apparent FOV | 68° |
| Eye Relief | 17mm |
| Barrel Size | 1.25" |
| Design | Modified Erfle |
| Elements/Groups | 7/4 |
| Series | Hyperion |
| Coating | Fully Multi-Coated |
| Waterproof | No |
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Amazon Reviews
For those of you who have purchased a telescope and are looking to upgrade your eyepieces, this Baader Hyperion is a good choice. This eyepiece, though large, works very well in my 6" Nexstar telescope. The previous eyepieces that I have owned actually work fairly well but the 68 degree field of vie...
This is a huge step up from the basic ploski lenses that you get with a telescope. It provides more than enough relief for me to be able to keep my glasses on while still seeing objects clearly. I did not notice distortion near the edges of the field. I did not like pairing it with a Barlow lens bec...
I am new to owning telescopes and eyepieces, so I don't have alot of money to buy an assortment of eyepieces. So after researching for awhile decided the Baader system will be best, as you can change the focal length by adding or removing spacers. This eyepiece turned my 4.5inch reflector into a muc...
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