Phoenix Astronomy RC20Carbon — 500 mm carbon RC The RC20Carbon is Phoenix Astronomy’s 500 mm Ritchey–Chrétien with a 4000 mm focal length. Its largely carbon-fibre structure has a basic mass of 49 kg.
Manufacturer model: Phoenix Astronomy RC20Carbon — 500 mm carbon RC · Specifications checked against manufacturer data on 2026-11-04
The RC20Carbon is Phoenix Astronomy’s 500 mm Ritchey–Chrétien with a 4000 mm focal length. Its largely carbon-fibre structure has a basic mass of 49 kg.
Installation and service
The split tube aids transport, and the primary-mirror cell is removable for maintenance. Backfocus is approximately 290 mm from the rear plate, with an M117 focuser interface.
Image field
Phoenix specifies no vignetting at 35 mm image-circle diameter, approximately 12.5% at 43 mm and approximately 20% at 54 mm with a 0.8× reducer. Linear obstruction is 49%. These are separate geometric measurements.
Actual manufacturer identified as Phoenix Astronomy and checked against its own bilingual product PDF, 20-inch technical data. Store TS Optics vendor/title/SKU are preserved. Retailer-only assertions are not the verification source.
Additional specifications
Linear obstruction (%)
49
Vignetting
0% at 35 mm; approximately 12.5% at 43 mm; approximately 20% at 54 mm with 0.8× reducer
Phoenix Astronomy RC20Carbon — 500 mm carbon RC The RC20Carbon is Phoenix Astronomy’s 500 mm Ritchey–Chrétien with a 4000 mm focal length. Its largely carbon-fibre structure has a basic mass of 49 kg.
Manufacturer model: Phoenix Astronomy RC20Carbon — 500 mm carbon RC · Specifications checked against manufacturer data on 2026-11-04
