Evostar 120ED Black Diamond — 120/900 This Black Diamond Evostar 120ED uses a 120 mm ED doublet objective and 900 mm focal length at f/7.5. The unobstructed refractor design is suitable for visual astronomy and, with the appropriate imaging accessories, astrophotography.
Manufacturer model: Evostar 120ED Black Diamond — 120/900 · Specifications checked against manufacturer data on 2026-11-04
This Black Diamond Evostar 120ED uses a 120 mm ED doublet objective and 900 mm focal length at f/7.5. The unobstructed refractor design is suitable for visual astronomy and, with the appropriate imaging accessories, astrophotography.
A dual-speed 2-inch Crayford focuser provides fine adjustment for an eyepiece or camera. Sky-Watcher lists an 8×50 finder, a 2-inch 90° dielectric diagonal with a 1.25-inch adapter, and a 2-inch LET 28 mm eyepiece for this legacy model.
MHTC optical coatings support light transmission. The manufacturer lists an OTA weight of 5.13 kg; a suitable equatorial mount must also accommodate the camera, diagonal and other fitted equipment. A matching imaging corrector is selected for this ED generation rather than for the newer EDX tube.
Sky-Watcher manufacturer documentation
Global legacy ED model and listed accessory specification used. The 120ED table repeats an implausible 100 × 620 mm tube dimension from the smaller model; that dimension is omitted.
Data sheet
Evostar 120ED Black Diamond — 120/900 This Black Diamond Evostar 120ED uses a 120 mm ED doublet objective and 900 mm focal length at f/7.5. The unobstructed refractor design is suitable for visual astronomy and, with the appropriate imaging accessories, astrophotography.
Manufacturer model: Evostar 120ED Black Diamond — 120/900 · Specifications checked against manufacturer data on 2026-11-04
