The Sky-Watcher Evostar 80ED is an 80 mm apochromatic doublet refractor using FPL-53 ED glass with 600 mm of focal length at f/7.5. The Evostar 80ED OTA weighs about 2.5 kg and is roughly 24 inches long with the dew shield, typically sold as an OTA with accessories rather than a full mount kit. The…
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StellaLyra 8″ f/6 and Apertura AD8 are both 203 mm (8″) parabolic-mirror Dobsonians with a 1200 mm focal length (≈ f/6). Vaonis Vespera II uses a 50 mm f/5 quadruplet apochromatic refractor with a built‑in camera and a Sony IMX585 sensor (8.3 MP). The StellaLyra and Apertura are manual Dobsonians on wooden alt-az mounts, while…
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The Celestron NexStar 8SE is a 203 mm Schmidt-Cassegrain with a GoTo computerized fork mount and f/10 optics, delivering bright, detailed views but at a high price for beginners. The Sky-Watcher 8-inch Dobsonian is a 203 mm reflector on a manual alt-azimuth mount with f/6, offering a large light bucket at low cost but no…
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The Nancy Grace Roman Space Telescope is planned to launch in late 2026 (latest commitment by May 2027) aboard SpaceX’s Falcon Heavy to a halo orbit around the Sun-Earth L2, about 1.5 million kilometers from Earth. Roman uses a 2.4-meter primary mirror repurposed from Hubble and a 300-megapixel Wide Field Instrument that covers about 0.28…
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