How can the Baader Hyperion 5mm eyepiece have multiple focal lengths?
The Baader Hyperion 5mm is a modular eyepiece. Its native focal length is 5mm, but you can change it by unscrewing the front lens element (the part inside the 1.25" barrel) and adding optional Baader Fine Tuning Rings (FTRs). For example, adding specific rings can convert it to a 2.6mm eyepiece, providing much higher magnification without needing a separate Barlow lens.
What do I need to connect a DSLR camera to the Hyperion 5mm eyepiece?
For eyepiece projection with a DSLR, you will need two accessories. First, the Baader Hyperion M43/T-2 Adapter, which screws onto the eyepiece's M43 thread (found under the rubber eyecup). Second, you will need a T-Ring specific to your camera's brand (e.g., Canon EOS, Nikon F). This combination creates a secure, threaded connection for imaging.
What makes the Phantom Group Coatings on the Hyperion 5mm special?
Baader's Phantom Group Coating is a state-of-the-art 7-layer broadband anti-reflection coating. Each layer is calculated for a specific glass type within the eyepiece and optimized for maximum light transmission at ~520nm, the peak sensitivity of the dark-adapted human eye. This results in higher contrast and brightness with minimal distracting reflections compared to standard multi-coatings.
Is the Hyperion 5mm a good choice for viewing Jupiter with an 8" SCT?
Yes, absolutely. An 8" f/10 SCT has a focal length of around 2000mm. The 5mm Hyperion would provide 400x magnification, which is an excellent power for viewing details like the Great Red Spot and cloud bands on Jupiter during nights of steady seeing. The 68° field would frame the planet nicely with a dark sky background.
Can I use 2" and 1.25" filters with the Baader Hyperion 5mm eyepiece?
Yes. The Hyperion 5mm has a 1.25" barrel that is threaded to accept standard 1.25" filters. While it comes with a 2" adapter sleeve, the filter threads are on the 1.25" barrel itself. You can also use Baader's 2" filters as part of the modular focal length system when the front lens group is removed.
What is the difference between the M43 and SP54 threads on the Hyperion 5mm?
Both are for connecting cameras, but for different methods:
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M43 Thread: This is the smaller thread used for eyepiece projection. It adapts to the common T2 thread (M42x0.75) and is ideal for cameras where the lens is removed (like DSLRs or astronomy cameras).
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SP54 Thread: This is the larger thread used for afocal projection. It's designed for cameras where the lens cannot be removed, such as point-and-shoot cameras or camcorders.
