OTA
GSO 20" F/8 Lightweight RC
GSO · 20" F/8 Lightweight RC · 19.75-inch Ritchey-Chrétien (RC) telescope
Key specifications
| Aperture | 500 mm |
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| Focal length | 4000 mm |
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| Focal ratio | f/8 |
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| Optical design | Ritchey-Chrétien |
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| Back focus | 400 mm |
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All specifications
| Focuser type | 3" dual-speed Linear Bearing Crayford |
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| Dovetail | Losmandy |
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About
A 500 mm f/8 lightweight Ritchey-Chrétien with hyperbolic low-expansion quartz mirrors, a 3" dual-speed linear-bearing Crayford focuser (EAF compatible) and three built-in cooling fans, for lunar, planetary and long-exposure imaging.