This 9mm Astro-Tech Value Line Plössl is a good quality medium high to high power eyepiece at a low, low price. It’s designed for high magnification lunar and planetary observing, bringing out detail in the smaller planetary nebulas, and for resolving globular clusters. It will work well with any telescope type, at any focal ratio. It is especially well suited to Schmidt-Cassegrains, where it provides close to the 1mm exit pupil recommended for maximum sharpness in observing lunar and planetary details. Eye relief is limited and will vignette the view for observers who must wear eyeglasses. However, this shouldn’t be an issue when observing small objects, such as planets, and when splitting binary stars.
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