The Sky-Watcher Esprit 120/840 mm APO arrived on March 16, 2017. The scope has been selected and optimized by Tommy Nawratil (many thanks for this). According to his tests on the optical bank, the lenses have a Strehl value of appr. 0.94, which is close to excellent.
The scope features a 3″ „Linear Power“ focuser and is supplied with a field flattener for photographic purposes. Sky-Watcher claims the corrected field will be 44 mm in diameter with the flattener.
For solar H-Alpha observation the Esprit is equipped with a 130 mm-D-ERF and a Daystar Quark-Chromosphere.
Some impressions from the Esprit 120/840 APO