Explore Scientific Dobson telescope N 305/1525 Ultra Light Generation II DOB (44833)

Dobsonian telescopes are among the most practical tools for astronomy, offering simplicity and brilliance in design. They consist of two main components: the optics, typically housed in a solid tube or truss tube design, and the mount, a wooden box (known as a "rocker box") that sits on the ground and holds the telescope. This straightforward design allows users to begin observing immediately without the need for complex setup or alignment procedures. The Dobsonian concept was born from the desire to create large telescopes at an affordable price—a goal that has been achieved remarkably well. Since their invention, Dobsonian telescopes have gained a loyal following dedicated to their simplicity and the idea of "high performance at low price."

Explore Scientific has further refined this classic design by offering lightweight tubular aluminum frames optimized for transport and quick deployment.

Key Features

• The secondary mirror mount can be securely adjusted without tools.

• The primary mirror is adjustable during observation and is housed in a modern cell with radial roller bearings and a 9-point flotation system.

• Large altitude bearings ensure smooth, judder-free movements, even at high magnifications.

• For transport, the cap and altitude bearings fit inside the rocker box, while the mirror box has a lid. This means only two aluminum boxes and one bundle of poles need to be transported.

• Extremely high structural rigidity ensures stability during use.

• Aluminum construction makes the telescope dew-resistant, eliminating issues like bulging press boards found in other designs.

• Two radial primary mirror fans allow rapid temperature adjustment for optimal performance.

New Features in the Second Generation

• Teflon sleeve bearings and GRP for highly sensitive tracking.

• Improved primary mirror cell with precise adjustment mechanisms.

• Double-sided friction settings and braking system for altitude bearings.

• Large feet for increased stability during use.

• Universal viewfinder shoe for easy finderscope upgrades.

• Includes two 1 kg counterweights for balancing.

• Quick-release fasteners with spring elements for convenient handling.

• Powder-coated altitude bearings for enhanced durability.

• Laser engraved primary mirror center mark for precise alignment.

Dimensions for the 305/1525 Ultra Light Model

• Rocker box dimensions: 450 x 450 x 320 mm

• Mirror box dimensions: 380 x 380 x 300 mm

• Pole length: approximately 980 mm

• Eyepiece height at zenith: approximately 1.4 m

• Total weight: 32.1 kg (mirror housing: 18.9 kg; upper section with secondary mirror + rocker box: 10 kg; four pairs of struts: 1.8 kg; pair of altitude bearings: 1.4 kg)

This telescope is one of the most transportable models of its size, offering exceptional adjustment stability and user-friendly operation. A comprehensive user manual ensures ease of use for all levels of experience.

Specifications

Optics

• Type: Reflector (Newtonian)

• Aperture: 305 mm

• Focal Length: 1525 mm

• Focal Ratio: f/5

• Resolving Capacity: 0.38 arcseconds

• Limiting Magnitude: 14.2

• Light Gathering Capacity: 1900x (compared to human eye)

• Maximum Useful Magnification: 610x

Tube Construction

• Design: Truss Tube

• Material: Aluminum

Reflector Details

• Primary Mirror Diameter: 305 mm

• Secondary Mirror Diameter: 75 mm

• Secondary Mirror Obstruction: 24%

• Mirror Cell Support Points: Nine-point flotation system

Focuser

• Type: Gear rack focuser with fine focusing (1:10 reduction)

• Eyepiece Connection Size: 2 inches

Mount

• Type: Dobsonian (Rocker Box)

• Material: Aluminum

Included Accessories

• Finder Scope: Red dot finder included.

• Eyepiece Adapter: Compatible with both 2" and 1.25" eyepieces.

• Antiglare Protector: Yes.

• Extension Tubes: Yes.

• Counterweights: Two counterweights, each weighing 1 kg.

General Information

• Total Weight: 32.1 kg (heaviest component weighs 18.9 kg).

• Eyepiece Height at Zenith: Approximately 1400 mm.

• Series Name: Ultra Light.

Areas of Application
Suitable for observing Moon & Planets as well as Nebulae & Galaxies but not recommended for Nature Observation, Astrophotography, or Solar Observation.

Recommended For
Not ideal for beginners but highly suited for advanced users seeking a portable yet powerful telescope.

The Explore Scientific Ultra Light Dobsonian telescope combines portability, stability, and ease of use with exceptional optical performance, making it an excellent choice for advanced amateur astronomers who value transportability without compromising on quality or functionality.