Sky-Watcher 150/750 Black Diamond Photo Newtonian OTA with Dual Speed Focuser

The Sky-Watcher 150/750 Black Diamond Photo Newtonian OTA is a powerful 150mm aperture reflector featuring diffraction-limited optics, providing all the light-gathering power you need for both visual use and astrophotography. Newtonian reflectors are among the most cost-effective designs on the market, offering much larger apertures than equivalently priced refractors. This large aperture is essential for resolving faint, extended objects like nebulae and galaxies, while the 750mm focal length is perfectly suited for revealing fine details within lunar craters. To ensure the highest image quality, the primary mirror features an aspheric parabolic profile to eliminate spherical aberration, while the secondary mirror uses extra-thin spider supports to minimize diffraction spikes and increase contrast.

Designed with precision in mind, this photo-optimized reflector is equipped with an excellent Crayford dual-speed focuser, which allows for fast, coarse regulation followed by a precise 10:1 reduction adjustment for achieving optimal focus. The telescope comes ready for immediate use with an included 3-element 28mm LET eyepiece, providing 27x magnification and a wide 56° apparent field of view with a comfortable 20mm of eye relief. Furthermore, the secondary mirror is engineered to be thin, allowing for fast cooling to ambient temperatures so you can begin high-contrast observations sooner.

Product Features in Detail

Precision Dual-Speed Focusing
When imaging planets or deep-sky objects, hitting the "sweet spot" of focus is notoriously difficult. The 10:1 reduction gear allows you to make microscopic adjustments that stay locked in place, ensuring your stars are the smallest points possible.

Deep-Sky Light Gathering
Compared to a standard 100mm telescope, this 150mm aperture collects over twice as much light. This is the difference between seeing a faint smudge and seeing the spiral arms of a galaxy or the delicate tendrils of a nebula.

The Parabolic Advantage
Many entry-level reflectors use cheaper spherical mirrors that cannot bring all light to a single point. By using a parabolic profile, Sky-Watcher ensures that every photon is focused perfectly, providing high-definition views across the entire frame.

Enhanced Contrast Spider Design
The "spider" is the bracket that holds the secondary mirror. By making these supports extra thin, this telescope reduces the amount of light scattered into the background, making the sky appear "blacker" and the targets pop with more contrast.

Versatile Focal Length
At 750mm, this telescope is wide enough to capture the entire Pleiades star cluster yet long enough to provide significant detail on the Moon and brighter planets, making it a "Jack-of-all-trades" for any astronomer.

Comfortable Visual Observing
The included 28mm LET eyepiece is a significant step up from standard "kit" eyepieces. With 20mm of eye relief, you don't have to press your eye against the glass, making for a much more relaxed and immersive observing experience.