Explore Scientific Ultra Light Dobson 305mm Generation II

Explore Scientific Ultra Light Dobson 305mm Generation II

Description

The Explore Scientific Ultra Light Dobson 305mm Generation II is a fully reengineered instrument that combines mechanical elegance with exceptional optical capabilities. Designed for advanced visual astronomers, it features a lightweight yet ultra-stable truss structure made entirely of metal — free from the swelling or warping common to traditional wood designs.

This Generation II model introduces several new features for optimized performance: improved primary mirror cell with precise collimation, dual-axis friction adjustment with braking system, TEFLON/GFK bearings for buttery-smooth movement, and spring-loaded quick-release handles for rapid, tool-free assembly.

Its 305 mm BK7 primary mirror gathers over 1800 times more light than the naked eye, delivering detailed planetary views and revealing the structure of faint nebulae and galaxies. The optical train is preconfigured for use with coma correctors, making this telescope an ideal companion for modern wide-angle eyepieces.

The entire assembly disassembles into compact parts for easy transportation, even in smaller vehicles. Large altitude wheels ensure smooth tracking, and supplied counterweights maintain balance with different accessories. The red dot finder attaches to a universal base.

Cooling is enhanced via two radial mirror fans, and a 2" Crayford focuser with 1:10 micro-reduction enables precise focus control. All components emphasize durability and convenience for field use.

Specifications

• Open-truss aluminum Dobsonian structure

• Aperture: 305 mm

• Focal length: 1525 mm (f/5)

• BK7 primary mirror with laser-marked center

• Enhanced mirror cell with fine adjustment

• Smooth TEFLON/GFK bearing motion

• Adjustable friction and brake on altitude axis

• Large altitude wheels for fine tracking

• 2" Crayford focuser with 10:1 reduction, M54 x 0.75 thread

• Backfocus: 45 mm (35 mm with 1.25" adapter)

• 24% central obstruction

• Theoretical resolution: 0.43"

• Total weight: 32.1 kg

• Transport dimensions:

  • Rockerbox: 450 x 450 x 320 mm

  • Mirror box: 380 x 380 x 300 mm

  • Truss length: approx. 980 mm

• Zenith observing height: approx. 1.4 m

• Extended warranty: 5 years

Additional information

• Portability: excellent

• Optical design: Newtonian reflector

• Application: visual deep-sky, lunar, and planetary observation

• User level: advanced observers, visual specialists

• Tube material: anodized aluminum

• Focuser: 2" Crayford with micro-focus

• 2" to 1.25" adapter included

• Extension tube included

• Two 1 kg counterweights included

• Two radial cooling fans for the primary mirror

• Batteries required (not included)

Included items

• 305 mm Ultra Light Dobsonian telescope

• Primary mirror box and truss structure

• Aluminum rockerbox

• Two 1 kg counterweights

• Deluxe red dot finder with universal base

• Secondary cage light baffle

• 2"/1.25" adapter

• Focuser extension tube

• Fan battery box with pouch

• Collimation tool for primary mirror

• Instruction manual