Sky-Watcher Evostar 90/660 AZ Pronto - Achromatic Refractor

Skywatcher Evostar 90/900 Refractor Telescope with AZ3 Mount

DESCRIPTION

The Skywatcher Evostar 90 AZ3 is a classical 2-element achromatic refractor telescope offering 90 mm aperture and 900 mm focal length. Thanks to its multicoated optics, it delivers sharp and contrast-rich images for observing the Moon, planets, or bright deep sky targets. The 45° Amici prism makes it equally suitable for terrestrial use.

Its AZ3 mount is intuitive and features slow-motion controls in both altitude and azimuth axes, ensuring stable and smooth tracking. A great beginner's telescope, well-suited for those looking for a versatile and easy-to-use refractor.

TECHNICAL SPECIFICATIONS

• Optical type: achromatic refractor

• Aperture: 90 mm

• Focal length: 900 mmThe Sky-Watcher Evostar 90/660 AZ Pronto is a versatile achromatic refractor designed to provide simple, convenient and accessible observing.

  Its 90 mm objective combined with a 660 mm focal length provides an f/7.3 focal ratio. This configuration is suitable for observing the Moon, planets and many deep-sky objects.

  Easy to transport and quick to set up, this refractor is particularly suitable for beginners looking for a straightforward first telescope. Its compact configuration is also useful for more experienced observers wanting a convenient grab-and-go instrument for short observing sessions.

  The telescope is mounted on the Sky-Watcher AZ Pronto alt-azimuth mount. It allows natural horizontal and vertical movement while providing slow-motion controls on both axes for accurate centring and manual tracking of celestial targets.

  An aluminium tripod with accessory tray completes the mount.

  The telescope is also supplied with two eyepieces, a red-dot finder, a 1.25-inch star diagonal and a universal smartphone adaptor for capturing celestial images with a compatible phone.

  90 mm Achromatic Objective

  The refractor uses a classic achromatic objective consisting of:

  • 2 optical elements
  • Air-spaced elements

  This design reduces chromatic aberration compared with a single lens.

  Objective diameter:

  • 90 mm

  The objective is also:

  • Multi-coated

  Light Gathering

  With its 90 mm objective, the Evostar provides:

  • 65% more light gathering than a 70 mm instrument

  This aperture allows the telescope to be used for both Solar System targets and many deep-sky objects.

  Focal Length and Focal Ratio

  Focal length:

  • 660 mm

  Focal ratio:

  • f/7.3

  This combination provides versatile astronomical observing performance.

  Moon and Planetary Observation

  The Evostar 90/660 can be used to observe:

  • Moon
  • Planets

  Its 660 mm focal length provides different magnifications depending on the eyepiece selected.

  Deep-Sky Observation

  The 90 mm aperture can also be used to observe many deep-sky objects.

  This versatility allows the observer to move easily between lunar and planetary viewing and more extended or fainter night-sky targets.

  Two Supplied Eyepieces

  Two Photo/Visual eyepieces are supplied:

  • 10 mm
  • 20 mm

  They provide the following magnifications:

  • 66x
  • 33x

  These two focal lengths provide two different magnification levels straight from the box.

  Highest Practical Power

  Highest practical potential power:

  • 180x

  Star Diagonal

  A star diagonal is supplied.

  Fitting:

  • 1.25 inch

  It provides a more comfortable observing position when the telescope is pointed towards objects high in the sky.

  Red-Dot Finder

  A red-dot finder is supplied with the telescope.

  It assists with initial aiming by allowing the observer to quickly locate the required area of sky before viewing through the main eyepiece.

  Universal Smartphone Adaptor

  A universal smartphone adaptor is supplied.

  It accepts smartphones between:

  • 54 mm
  • 90 mm wide

  The adaptor positions a compatible smartphone behind the eyepiece for capturing images of celestial objects through the telescope.

  AZ Pronto Alt-Azimuth Mount

  The AZ Pronto is a manually operated alt-azimuth mount designed for simple and intuitive operation.

  The telescope can be moved along two axes:

  • Azimuth, horizontal movement
  • Altitude, vertical movement

  This arrangement allows the telescope to be pointed naturally towards different parts of the sky.

  Slow-Motion Controls on Both Axes

  The mount includes slow-motion controls for:

  • Azimuth axis
  • Altitude axis

  These controls allow small and precise corrections after the telescope has been positioned manually.

  They also help with manual tracking as an object gradually moves across the eyepiece field.

  Movement Range

  Azimuth rotation:

  • 360°

  Altitude movement:

  • -70° to +90°

  This range allows the telescope to cover a very large part of the sky from a fixed observing position.

  Aluminium Tripod

  The AZ Pronto mount is supplied with:

  • Aluminium tripod
  • Accessory tray

  The tray keeps observing accessories close at hand during a session.

  Terrestrial Observation

  The Evostar 90/660 can also be used for terrestrial observation when fitted with an optional erect-image diagonal.

  With this accessory installed, the telescope provides an upright, correctly oriented image for terrestrial viewing.

  The erect-image diagonal is available separately.

  Simple and Portable Telescope

  The combination of a 90 mm refractor and manually operated alt-azimuth mount makes the complete system particularly straightforward to use.

  No complex alignment procedure is required before beginning visual observation. The telescope can simply be set up, pointed at the target and adjusted with the mount's slow-motion controls.

  This simplicity makes the telescope particularly suitable for:

  • Beginners
  • Quick observing sessions
  • Users looking for a portable telescope
  • Observers wanting a simple non-motorised setup

  Technical Specifications

  • Manufacturer : Sky-Watcher
  • Model : Evostar 90/660 AZ Pronto
  • Manufacturer product code : 10254
  • Optical design : Achromatic refractor
  • Objective design : 2 air-spaced elements
  • Objective diameter : 90 mm
  • Light gathering : 65% greater than a 70 mm instrument
  • Focal length : 660 mm
  • Focal ratio : f/7.3
  • Objective coating : Multi-coated
  • Supplied eyepieces : 10 mm and 20 mm Photo/Visual
  • Supplied magnifications : 33x and 66x
  • Highest practical potential power : 180x
  • Finder : Red dot
  • Diagonal : Star diagonal
  • Diagonal fitting : 1.25 inch
  • Smartphone adaptor : Universal
  • Compatible smartphone width : 54 to 90 mm
  • Mount : AZ Pronto
  • Mount type : Manual alt-azimuth
  • Slow-motion controls : Azimuth and altitude
  • Azimuth rotation : 360°
  • Altitude movement : -70° to +90°
  • Tripod : Aluminium
  • Accessory tray : Yes
  • Terrestrial observation : Possible with optional erect-image diagonal

  Package Contents

  • Sky-Watcher Evostar 90/660 refractor
  • AZ Pronto alt-azimuth mount
  • Aluminium tripod
  • Accessory tray
  • 10 mm Photo/Visual eyepiece
  • 20 mm Photo/Visual eyepiece
  • Red-dot finder
  • 1.25-inch star diagonal