Outfitted with a wide and useful focal length range that is ideal for all kinds of astronomical observation and astrophotography, the Baader Hyperion 8-24mm Mark IV Zoom Eyepiece with Barlow Lenswill be an invaluable addition to your telescope kit.

Its performance starts with a 7-element/4-group flat-field lens design that is treated with Phantom Coating Group multi-coatings. These features work together to deliver clear and bright high-contrast views with edge-to-edge sharpness without distortion or astigmatism. A simple rotating selection system allows users to run through the focal length range with positive click-stops at each setting, and for ease-of-use the eyepiece is parfocal so there will be little to no need to refocus when moving from one focal length to the next.

The Mark IV has been engineered for use on a wide variety of gear and comes with nosepieces to fit standard 1.25" drawtubes and accessories with the option to swap it for a 2" nosepiece or an adapter to thread onto standard 2" Schmidt-Cassegrain telescope (SCT) visual backs. Removing the eyecup reveals M43 T-mount threads that accept optional accessories from their Astro T-2 modular system, including camera-specific T-rings for projection astrophotography techniques, and extension tubes. For comfortable viewing, the eyepiece comes with three interchangeable eyecups: a fold-down rubber version, a winged model, and a large twist-up adjustable option.

From the moon to the planets to deep sky objects, the Mark IV zoom eyepiece provides versatility that is easy to use.

8-24mm Zoom Eyepiece    Phantom Coating Group Multi-Coatings    7-Element/4-Group Flat-Field Lens Design    1.25" and 2" Diameter Barrel Options    Parfocal through Entire Zoom Range    Three Interchangeable Eyecups    2.25x Modular Barlow Lens    Air-Spaced Triplet Lens Configuration    Anastigmatic Flat-Field Design    Internally Baffled and Blackened

• 7-element/4-group flat-field lens design maintains edge-to-edge sharpness
• Phantom Coating Group multi-coated optics maximize light transmission for improved contrast and clarity
• All focal length options are parfocal, requiring little to no refocusing when moving through the entire zoom range

• Change magnification by selecting a longer (low power) or shorter (high power) focal length
• Selectable focal length for 8mm, 12mm, 16mm, 20mm, and 24mm
• Field of view, eye relief, and field stop distance change based on focal length setting
• Positive click-stops provide tactile feedback for each focal length selection

• 1.25" nosepiece fits the most common-size drawtubes and accessories, threaded for standard 1.25" filters
• 2" nosepiece allows it to fit larger drawtubes and focusers, threaded for standard 2" filters
• Standard 2" SCT visual back female threads for direct connection to optical tube assembly
• Spotting scope adapter: For use on those spotters that accept astronomical eyepieces, it provides 4mm additional back focus to allow it to achieve the proper focus at infinity

• M43 thread on top of the eyepiece
• Allows attachment of any desired DSLR or T-2 accessory by means of the optional T-rings and camera-specific T-mounts
• Remove eyecup to reveal adapter threads
• Optional extension tubes may be required for full-frame and APS-C cameras

• Winged rubber eyecup blocks peripheral terrestrial light to improve contrast and eliminate distractions
• Fixed folding rubber eyecup allows easy use with or without eyewear
• Large adjustable twist-up eyecup provides precise eye relief setting

Related Questions and Answers

Q: 1. 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: 2. Are there t-threads behind the eyecup that a T-adapter can screw onto?

A: The Celestron 8-24mm Zoom Eyepiece (1.25") BH #CEEPZ824 • MFR #93230 has no T-threads.

Q: 3. What accessories would I need to mount my Nikon F-mount DSLR to this eyepiece to shoot through it?

A: A T-mount adapter; BH# VELANFT. And depending on sensor size, some combination of extension tubes from the Alpine Astro T2 System for full coverage; BH# ALT225A .

Q: 4. I have a Celestron TrailSeeker 80 spotting scope. It came with its own 8-24 zoom eyepiece. It's fine. But would this different 8-24 eyepiece be an upgrade? Is the quality higher? If so, great. If not, I'll stick with the original.

A: The Celestron 8-24mm Zoom Eyepiece (1.25") BH #CEEPZ824 • MFR #93230 is the same eyepiece that comes with the Celestron TrailSeeker 80 20-60x80 Spotting Scope.

Q: 5. Would this lens Will this EP work effectively in a f/10 C5 scope?

A: Yes this Eyepiece would work with that Scope.

Q: 6. 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: 7. This zoom eyepiece is 3 times the price of Celestron's zoom. Is it worth that difference in cost?

A: It has much higher optical quality due to the -Phantom Coating Group Multi-Coatings and 7-Element/4-Group Flat-Field Lens Design

Q: 8. What is the thread diameter and TPI or Pitch under the rubber eyecup?

A: That information is not published by Celestron

Q: 9. With the Barlow attached, this effectively goes between 3.5mm - 10mm, right?

A: With a 2X barlow correct

Q: 10. 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.)