With a wide angle of view and generous eye relief, the Alpine Astronomical Baader Hyperion 68° 5mm Astronomical Eyepiece delivers the performance that avid amateur astronomers demand for viewing and imaging. Engineered with an 8-element/5-group lens design, the eyepiece features Baader's proprietary 7-layer broadband multi-coatings to maximize light transmission across the entire visual spectrum with true color rendition and without the green tint and halos common in many astronomical eyepieces.

Baader made this eyepiece with a unique modular design that allows it to fit into standard 1.25" holders and accessories with the ability to remove the primary snout and have it fit into larger 2" holders. Since one of the lens groups is in the 1.25" snout, when it is removed it changes the focal length without changing the brightness or long 20mm eye relief. The focal length can also be changed through the use of compatible filters—allowing you to customize the magnification yield based on your optical tube assembly and need.

The eyepiece comes with a fold-down rubber eyecup for use with or without eyewear, and the eyecup can be completely removed to reveal a set of two threads. These M43 and M54 threads allow T-rings and other adapters to be mounted for direct connection of imaging systems for afocal and projection astrophotography techniques. This model is parfocal with all other Hyperion eyepieces except the 24mm version, which means there is little to no need to refocus when changing eyepieces within the Hyperion line.

5mm Focal Length    Wide 68° Field of View    8-Element/5-Group Lens Design    7-Layer Broadband Multi-Coatings    1.25" & 2" Diameter Barrel    M43 and M54 Imager Threads    Fold-Down Rubber Eyecup    Parfocal with Most Hyperion Eyepieces

Related Questions and Answers

Q: 1. Is this a #8 Yellow?

A: No it is not. A Yellow #8 is typically used for an increase in contrast with black and white films. The Alpine Astronomical Baader Yellow Colored Bandpass Eyepiece Filter is centered on the 495nm wavelength suppresses the secondary blue spectrum when using achromatic and half-apochromatic refractor telescopes, increasing image sharpness.

Q: 2. I have this unit purchased, but it is on back order. Now I am looking at filters to go with it. Do filters need to be 1.25" or 2" in diameter to work in combination with this eyepiece?

A: You may use both 1.25" filters and 2" filters with the Alpine Astronomical Baader Hyperion 8-24mm Mark IV Zoom Eyepiece (1.25"/2"). According to the manufacturer, the Alpine Astronomical Baader Hyperion 8-24mm Mark IV Zoom Eyepiece (1.25"/2") includes both 1.25" and 2" barrels. The 1¼" Barrel is threaded for standard 1¼" filters, and the 2" Barrel for standard 2" filters.

Q: 3. How do you fit this eyepiece to the diagonal that comes standard with Celestron Nexstar 8SE?

A: It fits the Celestron 8se directly as long as you are not using the 2" Schmidt-Cassegrain Adapter.

Q: 4. Does this work for visual astronomy also, or is it more designed for astrophotography?

A: Yes, this can be used as a conventional Barlow for viewing.

Q: 5. is this a filter that makes planets less bright?

A: Yes, Neutral Density filters make things darker however. It is mainly for use with the moon. The Alpine Astronomical Baader 0.6 Neutral Density Filter to reduce the amount of light coming into your eye during lunar observation and improve the view and contrast.

Q: 6. what does focal length of 21mm eyepiece become when the snout is removed?

A: The Alpine Astronomical Baader Hyperion 68° 21mm Astronomical Eyepiece (1.25"/2") would become 32.2mm with the snout removed.

Q: 7. It says you can remove the smaller nosepiece to use the 2" barrel. But it changes the focal length. To what?

A: This is the only information being offered by Alpine Astronomical https://alpineastro.com/products/baader-13mm-hyperion-68-modular-eyepiece#description

Q: 8. Is this eyepiece waterproof?

A: The Alpine Astronomical Baader Hyperion 8-24mm Mark IV Zoom Eyepiece (1.25"/2") BH #ALHYPZOOM • MFR #HYP-ZOOM is not waterproof.

Q: 9. Is this eyepiece barrel 1.25/2" or only 1.25" ?

A: The Alpine Astronomical Baader Hyperion 68° 10mm Astronomical Eyepiece (1.25"/2"), will work both with 1.25" and 2" holders." (We can see in the Overview it is explained-This eyepiece with a unique modular design that allows it to fit into standard 1.25" holders and accessories with the ability to remove the primary snout and have it fit into larger 2" holders as well.)

Q: 10. Is this filters that make planets less bright?

A: The Alpine Astronomical Baader 3.0 Neutral Density Filter is used to reduce the amount of light coming into your eye during lunar observation and improve the view and contrast. It is not made for planetary use.