What kind of views can I expect with the Omni 15mm eyepiece in an 8" f/10 SCT?
In a typical 8" f/10 Schmidt-Cassegrain telescope (like a Celestron NexStar 8SE or CPC 800), the Omni 15mm eyepiece will provide approximately 135x magnification. This is an excellent power for resolving details in Jupiter's cloud belts, viewing the Cassini Division in Saturn's rings, and resolving individual stars in bright globular clusters like the Hercules Cluster (M13).
Is the 13mm eye relief of the Omni 15mm sufficient for eyeglass wearers?
The 13mm eye relief is a comfortable distance for most users. For eyeglass wearers, it's generally considered a borderline but usable distance. You can fold down the rubber eyeguard to get your eye closer to the lens, which should allow most people to see the majority, if not all, of the 50° apparent field of view.
How does the Omni 15mm compare to a standard 25mm kit eyepiece?
The Omni 15mm eyepiece will provide significantly higher magnification than a 25mm eyepiece. In a telescope with a 1000mm focal length, a 25mm eyepiece gives 40x magnification, while the 15mm Omni provides 67x. This makes the 15mm much better for observing smaller targets like planets and double stars where more power is needed to see detail.
Can I use the Celestron Omni 15mm for astrophotography?
While not its primary purpose, you can use the Omni 15mm for basic afocal astrophotography (holding a smartphone to the eyepiece) or eyepiece projection imaging with a dedicated adapter. It is best suited for bright targets like the Moon and planets. For serious deep-sky imaging, a dedicated prime-focus camera is recommended.
What is the benefit of the Omni 15mm's blackened lens edges?
Blackening the edges of the 4 lens elements is a feature typically found in more expensive eyepieces. It prevents stray light from reflecting off the glass edges inside the eyepiece barrel. This results in a darker background sky and higher image contrast, making faint details on planets or in nebulae easier to see.
Will the Omni 15mm eyepiece work with my 60mm refractor?
Yes, as long as your refractor has a 1.25" focuser, the Omni 15mm is an excellent choice. For a typical 60mm refractor with a 700mm focal length, this eyepiece would provide about 47x magnification, a very useful power for lunar and planetary observing that is well within the capabilities of the telescope.
