It has a usable eye relief of 13mm, excellent for an eyepiece in this focal length range. The six lens/four group design and two ED (Extra-low Dispersion) glass elements of the 8mm Astro-Tech Paradigm provides all of the optical virtues described at the top of this catalog page - high contrast, a sharp and flat field from edge to edge, excellent color fidelity, and exceptionally low astigmatism and barrel distortion. ![]() Its sharpness and lack of astigmatism across the field makes smaller globular clusters vivid and nearly three-dimensional. If so-so seeing is the norm where you observe, its 8mm focal length may represent the shortest focal length practical with a long focal length telescope for observing lunar and planetary detail, resolving globular clusters, picking up small planetary nebulas against a stellar background, etc.Ĭontrast is very good for planetary and lunar use, rivaling that of orthoscopics and Brandons, but with a substantially wider field of view and excellent eye relief. Below average seeing conditions may limit its performance. This Astro-Tech 8mm Paradigm Dual ED eyepiece is a logical choice for high quality/high magnification observing with long focal length refractors, reflectors, or catadioptric scopes under good to somewhat better than average seeing conditions. Various Used and Demo Scopes and Mounts.Astro-Tech AT60ED and AT72EDII Black Friday Sale.Explore Scientific Nebraska Star Party Sale.Various Closeouts Meade, Kendrick, Bob's Knobs, JMI and others.Astronomics Used, Demo, Closeout, Spring Cleaning Page. ![]() Rechargeable Batteries And Power Supplies.Personal Planetariums / Electronic Sky Guides.Focal Reducer and Field Flattener Combos.Equatorial & Altazimuth Accessories & Adapters.
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