OTA Dual Speed ​​150/600 Black Diamond Telescope

• Perfect instrument for beginners and advanced players.
• Planetary multipurpose and deep sky initiation.
• Includes Crayford focuser with 10:1 ratio (best sharpness adjustment)
• Oriented for astrophotography with a resulting focal ratio of f/3.45
• 0.86x coma corrector/focal reducer included

For astrophotographers, in order to offer better performance in deep sky images, Sky-Watcher has reduced the focal length of the "classic" Black Diamond range to f/4 to offer a wider field and significantly faster photographic speed (2 times between two instruments). at f/4 and f/5). For the same exposure time, a shorter focal length ratio allows more signal to be obtained or an equivalent signal to reduce the exposure time. In addition, the size of the tube is reduced, which also means less wind resistance.

Its Newton design offers several advantages over other instrument families (Cassegrain and refractors). Mirrors are cheaper to manufacture for the same diameter and their focal ratio is generally very low. In this way you will be able to benefit, for an attractive price, from a bright telescope that offers a very wide field of observation (in this case f/D=4) . The central obstruction is also weaker than that of Cassegrain-type telescopes.

With a 150mm primary mirror, The Sky-Watcher Newton 150 collects 73% more light than a 114 mm telescope . Under a very dark sky, it is possible to see many objects in the sky barely distinguishable with smaller diameter instruments. Promises beginners many discoveries . In planetary observing, you will reveal many details about Jupiter, Saturn and the Moon using a Barlow lens or short focal length eyepiece.

Unlike very cheaply made or small diameter Newton telescopes, the 150, 200, 254 and 300 mm Newton Sky-Watchers They have a parabolic primary mirror . The mirrors are polished spherically and then trimmed to achieve a parabolic shape (more expensive and difficult to obtain). This is an essential selection criterion for instruments larger than 130 mm and with short f/D .

Focusing is achieved using a dual-flow Crayford eyepiece. Allows you to obtain fine focus thanks to 1:10 reduction . A very noticeable advantage during observations with high magnifications and when taking images. Can support heavy loads (e.g. APN) . A 31.75mm adapter is supplied as standard to use eyepieces of the same format from the 50.8mm output. An adjustment screw located at the bottom of the eyepiece holder allows you to maintain focus by following the orientation of the optical tube.

To present as little obstruction as possible, the secondary (flat) mirror mounting bracket has 4 thin branches , with a width of 0.5 mm. Being sufficiently rigid, they limit diffraction peaks in bright stars and excessive luminosity loss. A 6x30 achromatic finderscope on its support is also supplied as standard.

Specifications

Items delivered:

• 1 Sky-Watcher 150mm f/4 optical tube
• 1x 22mm 70° ultra wide eyepiece (without protective caps)
• 1x 6x30 straight finder
• 1x Corrector/Reducer 0.86x (M48)
• 1x Crayford Sky-Watcher 50.8mm focuser with microfocuser (dual speed 1:10) and 31.75mm adapter
• 2x fixing clamps
• 1x Vixen type integrated male dovetail
• 1x Piggyback mount for Kodak camera on top of one of the mounting collars