| This short focal length TeleVue Radian eyepiece is an excellent choice for high magnification observing with long focal length refractors, reflectors, or catadioptric scopes under good to somewhat better than average seeing conditions. Contrast is very good for planetary and lunar use, rivaling that of orthoscopics and Brandons, but with a substantially wider field of view and unsurpassed eye relief. It is also exceptional for medium power viewing with short focal length refractors and fast focal ratio Dobsonian reflectors. Its high contrast makes it an exceptional choice for resolving detail in planets and planetary nebulas, while its sharpness across the field makes smaller globular clusters vivid and nearly three-dimensional. It is more or less regularly useful with long focal length scopes, but below average seeing conditions may limit its performance. If so-so seeing is the norm where you observe, its 8mm focal length may represent the maximum practical with a long focal length scope. |
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