Baader Planetarium Hyperion 13mm 68° eyepiece 2″/1.25″
If you are looking for an eyepiece that goes beyond ordinary telescope accessories, the Baader Hyperion series is exactly what you need. This 13mm eyepiece with a 68° apparent field of view is not designed just for comfortable visual observing - it is a well-thought-out modular optical system that can do much more. Whether you observe planets, enjoy wide star fields, or are interested in afocal photography, the Hyperion 13mm opens new possibilities without the need to buy several different eyepieces.
High-quality optics for sharp, neutral images
The core of this eyepiece is an 8-element optical design arranged in 5 groups, which delivers excellent sharpness across the entire field of view and clean, neutral colour rendering without unwanted colour casts. All optical surfaces are treated with a fully multi-coated (FMC) anti-reflection coating, which minimises light loss and suppresses unwanted reflections. The carefully blackened interior of the barrel further eliminates scattered light and contributes to high image contrast - something you will especially appreciate when observing planets or double stars against a lighter background.
Comfortable eye relief for all observers
The Hyperion 13mm offers a generous 20mm eye relief, which is a comfortable value even for observers who wear glasses. The rubber adjustable eyecup allows you to fine-tune the eye position precisely, without any mechanical discomfort during long observing sessions.
Modular design - two eyepieces in one
One of the greatest advantages of the Hyperion series is its modular philosophy. By unscrewing the negative front element, you get a fully functional 6-element 2″ Erfle eyepiece with a significantly longer focal length - and therefore a different magnification and field of view. This feature is unique and means that for the price of one eyepiece you have two optically capable configurations available for different situations.
The eyepiece fits both standard focuser sizes:
- 1.25″ (31.75mm) focuser
- 2″ (50.8mm) focuser
Ready for afocal photography
The Baader Hyperion 13mm is fully prepared for afocal photography. Two standard threads are integrated directly into the eyepiece barrel - M54 and M43 - protected by rubber caps. These allow you to attach a digital compact camera or another camera with a suitable adapter, without purchasing special add-ons. Adapters for the most common photographic thread sizes are available as optional accessories.
This is particularly useful when photographing the Moon or planets, where the afocal method produces excellent results even without expensive dedicated imaging equipment.
Technical specifications
| Parameter |
Value |
| Focal length |
13mm |
| Apparent field of view |
68° |
| Eye relief |
20mm |
| Optical design |
8 elements in 5 groups |
| Coatings |
FMC (Fully Multi-Coated) |
| Barrel size |
1.25″ / 2″ |
| Built-in threads |
M54 and M43 |
| Modular front element |
Yes - 6-element 2″ Erfle configuration |
Who is this eyepiece for?
The Baader Hyperion 13mm is a choice for observers who do not want to make compromises - neither in image quality nor in versatility. The combination of premium optics, modular design, and built-in photography readiness makes it one of the best investments in your astronomy equipment at this price level. Whether you point your telescope at nebulae, planetary details, or the Moon, the Hyperion 13mm will not disappoint.
