EXPLORER-250PDS

254mm (10") f/4.7 Parabolic Dual-Speed Newtonian Reflector OTA

EXPLORER-250PDS
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SRP: £449.00

Product Code:  10221
Brand:  Sky-Watcher



Sky-Watcher



  • Sir Patrick Moore CBE FRS"I have used a great number of telescopes; some are good, some mediocre and some bad. To me the Sky-Watcher range of instruments are very good indeed, and suited to amateurs of all kinds – and they are not priced out of the market! Excellent value.
    Use them and enjoy them."
    Sir Patrick Moore CBE FRS (1923 to 2012)
  • Ade Ashford Says..."Having tested and reviewed a wide range of astronomical telescopes over the last couple of decades, for me there's one manufacturer that's risen above the rest in terms of delivering a coherent range of uncompromising, well-conceived designs, embodying consistently good optics and sensibly engineered mounts at very competitive prices — that's Sky-Watcher!!"Ade Ashford BScAde Ashford has tested and reviewed astronomical equipment in a professional capacity for several publications, including Sky & Telescope, Astronomy Now & BBC Sky At Night Magazine.

The new Sky-Watcher EXPLORER-250PDS Newtonian Reflector incorporates the same superb mirror-set as the Explorer-250P Black Diamond Series, but with two significant advantages. A Dual-Speed 10:1 ratio focuser is now included for excellent focusing precision. Also the tube length has been slightly shortened to optimise performance for prime-focus photography.

Even better performance for astro-photography and visual use can be achieved when used in combination with Sky-Watcher’s Newtonian coma corrector (Prod.Code 20233)

Standard Specification:

  • Magnifications (with eyepieces supplied) x43
  • Highest Practical Power (Potential) x500
  • Diameter of Primary Mirror 254mm
  • Telescope Focal Length 1200mm (f/4.7)
  • Eyepieces Supplied 28mm LET (2"/50.8mm)
  • 9x50 Finderscope
  • Parabolic Primary Mirror
  • 2" (50.8mm) Dual-Speed 10:1 Crayford Focuser
  • 0.5mm Ultra-Thin Secondary Mirror Supports
  • 56% more Light-Gathering than 200mm
PARABOLIC PRIMARY MIRRORS
Features High Quality Parabolic Primary Mirrors to eliminate spherical aberrations inherent in 'fast' focal lengh reflectors with spherical primary mirrors. The mirrors are parabolized to bring all the light rays to the same focal point to give sharp, constrasty 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.
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