BK 120ED EQ6 SynScan
Black Diamond ED Refractor
Product Features

Observing with Black Diamond 120 ED

The additional aperture of this telescope provides a dramatic increase in resolution and a heightened sense of seeing lunar and planetary surface phenomenon in seemingly 3D-like high-definition. Tight globular star clusters like M13 in Constellation Hercules appear like a beehive of crisp stellar pinpoints, star upon thousands of stars deep into the objects core. In Deep-space, rich aggregates of stars within Galaxies, Nebulas, and open clusters appear brilliant contrasted against a very dark velvet black background. The wispy, delicate, featherlike structure of dust lanes and extension of glowing gasses can be seen reaching out far beyond the object’s core.

Metallic High-Transmission Lens Coatings 

Each air-to-glass lens surface has exotic anti-reflection metallic coatings applied to ensure optimum light through-put of approaching 99.5%. The proprietary Sky-Watcher “Metallic High-Transmission Coatings” (MHC) are the finest photon anti-rejection coatings in their class.

Light-Baffled Optical Systems

The objective lens cell is light-baffled to reject stray, unfocused light. The draw tube is likewise baffled to ensure optimum contrast. The tube interior is flat blackened to help prevent unfocused internal light reflections from reaching the focal plane.

Precision 2” Dual Speed Crayford Focuser as Standard

Optical focus is achieved by means of a mechanically ultra-smooth, backlash-free, precision 2” Dual Speed Crayford Focuser-assembly. This focuser offers fine and ultra-fine focusing adjustments.

Tube Materials

The optical tube material is rolled steel, powder-coated reflective gloss black with gold fleck accent. The front and back cells are cast-aluminum painted white, or black. 

Telescope Tube Attachment Hardware

The optical tube comes with attachment hardware that allows it to be securely fastened to any Sky-Watcher mount. The quick-release tube rings provided with Black Diamond ED120 SCHOTT are cast aluminium, painted white.

Included Components for Selected Models*

Black Diamond 120 ED SCHOTT is supplied with backlash-free 2” Dual Speed Crayford Focusers and quality foam-lined Aluminum carrying cases as standard equipment. 

EQ6 SynScan Mount

For novice users, the user-friendly menu allows automatic slewing to over 13,400 objects. Even an inexperienced astronomer can master its variety of features in a few observing sessions. The SynScan Hand Control also has the ability to connect to a computer via an RS-232 cable. Once the connection has been established between the computer and SynScan Hand Control, many commercially available planetarium software programs can be used to control the EQ6 PRO Mounts, They also come with features that advanced astronomers can appreciate:

  • Positioning Accuracy up to 1 arc minute. Accuracy enhanced by software collimation error (mount mechanical error) compensation.

  • Stepper motors with 1.8° step angle and 64 micro steps driven.

  • Slewing speed up to 3.4°/sec (800X).

  • Auto Guider Interface for astrophotography.

  • Guiding speed selectable from 0.25X, 0.50X, 0.75X, or 1X.

  • Minimal vibration for steady long-exposure photography.

  • Periodic Error Correction


  • Tripod: Stainless Steel Legs

  • Counterweight Shaft Diameter: 1.8cm

  • Counterweight Shaft Length: 28.5cm

  • Mount Weight (without counterweight): 16Kgs

  • Mount Height: 41cm

  • Total weight: 23.5kgs (without counterweights)

  • Motor Type: Microstep drives 1.8-degree stepper motors

  • Motor Resolution: 0.144 arcsec (or 9.024,000 steps/rev.)

  • Power Supply: 11 to 15 V DC 2Amp (Tip positive)

  • Gear Ratio: 705

  • *13" Dovetail Bar

  • SynScan Hand Control

Review in Astronomy Technology Today by James R. Dire, Ph.D.  

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Optical Design ED Apochromatic Refractor 
Optical Diameter 120mm 
Focal Length 900mm 
F/Ratio F/7.5 
Highest Practical Power 240x 
Faintest Steller Magnitude 13.1 
Finder Scope 8X50 
Focuser Diameter 2" dual speed, crayford 
Diagnol 2" 90 deg. Dielectric Diagonal with 1.25" adapter 
Eyepieces LET 2"-28 
Tube Weight 5.13kg 
Tube Dimensions 10 cm x 62cm 
Shipping Weight 18+21+19 kg 
Shipping Dimensions 120x45x46 cm3; 117x28x29 cm3; 55x55x25 cm3