The Sky-Watcher Evostar 90/660 AZ Pronto is a two-element, air-spaced achromatic refractor telescope designed for ease and versatility. Its 90mm lens and f/7.3 focal ratio capture bright, high-contrast views of the Moon, planets, and deep-sky objects like the Orion Nebula. Weighing just 6.25kg, with a compact 66cm optical tube, it’s a grab-and-go astronomy telescope ideal for spontaneous stargazing sessions or daytime birdwatching (with an optional erect-image diagonal). The AZ Pronto alt-azimuth mount ensures smooth, intuitive tracking, making it a top choice for novices.

• Best For:

  • Stargazing: Moon, Saturn’s rings, star clusters.

  • Terrestrial Viewing: Wildlife or landscapes (with optional diagonal).

  • Global Use: Urban balconies, rural campsites, or dark-sky parks like Exmoor.

Key Specifications & Features

1. Optical Performance

• Optical Design: Two-element, air-spaced achromatic refractor.

• Aperture: 90mm (3.5 inches), offering solid light-gathering power.

• Focal Length: 660mm, f/7.3 focal ratio for sharp, versatile views.

• Objective Lens: Multi-coated crown and flint glass, minimizing chromatic aberration.

• Limiting Magnitude: ~12, suitable for bright deep-sky objects.

• Maximum Useful Magnification: 180x, ideal for planetary details.

2. Accessories & Magnification

• Eyepieces: 1.25” 10mm (66x) and 25mm (26.4x) Super-MA eyepieces.

• Finder Scope: 6x30 straight-through finderscope for easy target location.

• Diagonal: 45° star diagonal (1.25”) for comfortable viewing.

• Benefits:

  • Magnifications (26.4x, 66x) suit wide-field and high-power observing.

  • Finderscope aids star-hopping in light-polluted skies.

3. Mount & Portability

• Mount: AZ Pronto alt-azimuth with slow-motion controls for precise tracking.

• Tripod: Adjustable aluminum (78.5-150cm height), with accessory tray.

• Weight: Telescope 2.4kg, mount and tripod 3.85kg, total ~6.25kg.

• Portability: Compact for travel to dark-sky sites or backyard setups.

4. Build & Usability

• Material: Durable plastic tube with metal thumbscrews, lightweight yet sturdy.

• Assembly: ~5 minutes, beginner-friendly with basic manual.

• Setup: Vixen-style dovetail for quick mount attachment.

Why Choose Evostar 90/660 AZ Pronto?

1. Clear, Vibrant Optics:

   • 90mm lens delivers crisp Moon and planetary views, outperforming smaller 70mm scopes.

   • f/7.3 focal ratio balances wide-field and detailed observing.

2. Effortless Operation:

   • AZ Pronto mount with slow-motion cables simplifies tracking stars or birds.

   • Lightweight 6.25kg design is perfect for quick setups in urban or rural settings.

3. Versatile Applications:

   • Stargazing in city suburbs (e.g., London) for bright objects.

   • Terrestrial viewing in national parks (e.g., Yellowstone) with optional diagonal.

4. Beginner-Friendly:

   • Intuitive controls and included accessories make it ready-to-use out of the box.

   • Classic refractor design meets expectations of a “real” telescope.
     
     

     Optical Info
     Optical Design	Refracter
     Lens Coatings	Fully multi-coated
     Lens Design	Air Spaced
     Primary Aperture (mm)	90
     F/Ratio	7.3
     Light Gathering	65% more than 70mm
     Focal Length (mm)	660
     Mechanical Specifications
     Focuser	1.25”
     Focuser: Rotatable?	No
     Retractable dew shield	no
     OTA Weight (with accessories)	5.3 lbs/2.4kgs
     Mounting rings	Yes(optional)
     Mount	AZ PRONTO Alt-Azimuth Mount & Aluminium Tripod with Accessory Tray
     Mount Rotation Angle	360° (Azimuth), -70° to + 90° (Altitude)
     Dovetail type	V-style dovetail
     Accessories
     Eyepieces	Yes(1.25” super 25mm/10mm)
     Diagonal	Yes
     Mounting Hardware	Clamshell/Dovetail
     Camera Adapter	No
     Flattener or Corrector	No
     Collimation eyepiece	No
     Finder	Yes, Red dot
     Case	No