| This is an economical very wide field medium power eyepiece for lunar observing, resolving globular clusters, picking up detail in emission and reflection nebulas, etc. Its 15mm focal length is good for filling in the gap between the 25/26mm eyepiece that comes standard with most telescopes and a high power planetary/binary star splitting eyepiece. With short focal length refractors and fast focal ratio reflectors, it gives a “picture window on space” image. Even medium focal length telescopes provide impressive views. The f/4 Meade 8” Schmidt-Newtonian reflector, for example, yields a 3.75mm exit pupil, 54x, and a generous 1.3° field of view that’s good for observing open clusters such as the Pleiades; large nebulas such as the Lagoon, Veil, and Orion; and large globulars such as M-13 and Omega Centauri. All will fit nicely into the field of view, with a framework of black velvet sky around them to set off their subtleties. Globular clusters and nebulas are vivid and nearly three-dimensional. The 5mm eye relief is a quite short for those who must wear eyeglasses while observing due to astigmatism, and will vignette the field. Those who don’t have to wear glasses while observing will find they have to move their head from side to side while observing to see the entire huge field of view. |
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