250PDS Black Diamond — 250/1200 dual-speed Newtonian The 250PDS Black Diamond is a 250 mm parabolic Newtonian with 1200 mm focal length and f/4.8 focal ratio. It combines visual observing with prime-focus imaging capability.
Manufacturer model: 250PDS Black Diamond — 250/1200 dual-speed Newtonian · Specifications checked against manufacturer data on 2026-11-04
The 250PDS Black Diamond is a 250 mm parabolic Newtonian with 1200 mm focal length and f/4.8 focal ratio. It combines visual observing with prime-focus imaging capability.
The PDS design uses a shortened tube and secondary-mirror positioning intended to provide imaging focus. Its 2-inch dual-speed Crayford focuser gives 10:1 fine adjustment. A correctly matched Sky-Watcher coma corrector is optional for improving star shapes away from the optical axis.
The manufacturer lists a 8×50 finder and 2-inch LET 28 mm eyepiece. The tube measures 288 mm in diameter by 1120 mm long and has a published OTA weight of 14.38 kg. Select the mount for the complete imaging load and tube size.
As a Newtonian reflector, the telescope requires correct primary and secondary alignment. Fit the camera and any coma corrector using the correct adapter and spacing for that accessory.
Sky-Watcher manufacturer documentation
Global PDS specification used consistently. Regional Japanese masses include different attachment/accessory configurations and are not mixed into this table.
| Highest practical power | 500 |
|---|---|
| Imaging corrector | Optional matching Sky-Watcher coma corrector |
| Imaging geometry | Shortened tube/optimised secondary position for prime-focus imaging |
Data sheet
250PDS Black Diamond — 250/1200 dual-speed Newtonian The 250PDS Black Diamond is a 250 mm parabolic Newtonian with 1200 mm focal length and f/4.8 focal ratio. It combines visual observing with prime-focus imaging capability.
Manufacturer model: 250PDS Black Diamond — 250/1200 dual-speed Newtonian · Specifications checked against manufacturer data on 2026-11-04
