StarGate-450P 458MM (18") F4.1 Parabolic Truss Tube Dobsonian Sky-Watcher StarGate Dobsonians with their huge light gathering capabilities provide the ultimate WOW factor experience for aficionados of visual astronomy. The elegant and rigid all metal truss tube design is easily transportable when unassembled, and can be assembled and ready for use in less than 20 minutes. The mount provides smooth manual operation in both Alt and Azimuth axes. Delivers outstanding performance on Planetary and Deep-Sky objects.
- Magnifications (with Eyepieces supplied): x68 & x190
- Highest Practical Power (Potential): x916
- Diameter of Primary Mirror: 458mm
- Telescope Focal Length: 1900mm (f/4.1)
- Eyepieces Supplied: 10mm (1.25") & 28mm (25")
- Collimating Eyepiece (1.255")
- Dual-Speed 2" Crayford Focuser with 1.255" adaptor
- Parabolic Primary Mirror (Patented weight saving design)
- 120mm Secondary Mirror
- 9x50 Finderscope
- Direct SLR Camera Connection
- Alt-Azimuth mount (Metal construction)
- 31% more Light Gathering than 400mm
- Overall Weight 50kg
PARABOLIC PRIMARY MIRRORS
Features High Quality Parabolic Primary Mirrors to eliminate spherical aberrations inherent in 'fast' focal length reflectors with spherical primary mirrors. The mirrors are parabolized to bring all the light rays to the same focal point to give sharp, contrasty images, which are full of detail.
SKY-WATCHER DELUXE MIRROR COATINGS
Most reflectors today usually have a coat of aluminium as the mirror surface and then an overcoat of silicon monoxide or silicon dioxide to protect it. Silicon dioxide produces a much more durable coat than silicon monoxide but requires specialized equipment to apply it and is therefore more expensive. Protection is needed, because in most reflectors, the mirror is open to the elements and deterioration of the reflective layer reduces the resolution of the telescope. ALL Sky-Watcher reflectors are Multi-Coated with Silicon Dioxide as standard for Optimum Durability and Long Term Performance.