Omegon N 102/640 Dobsonian Telescope
For compact backyard observation, the Omegon N 102/640 Dobsonian Telescope combines a 102mm spherical Newtonian reflector with 640mm focal length and a wooden tabletop rocker base.
- 102mm aperture provides 1.14-arcsecond resolution
- 640mm focal length uses f/6.3 optics
- Tabletop rocker supports manual movement
- 25mm and 10mm eyepieces included
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Description
Observe deep-sky star fields and open clusters from your backyard with the Omegon N 102/640 Dobsonian Telescope compact tabletop Newtonian reflector system. Designed in Germany, this f/6.3 telescope features a 102mm (4.02 inches) aperture and a 640mm focal length. The Omegon N 102/640 delivers 1.14 arcsecond Dawes resolving power and reaches magnitude 11.8 for astronomy enthusiasts.
The Omegon N 102/640 Dobsonian Telescope utilizes a spherical BK7 optical glass primary mirror with a standard aluminum coating and protective monoxide layer. Its roll-formed heavy-gauge steel cylinder shell features synthetic protective end rings and rear secondary collimation screws. Mounted onto a wooden tabletop rocker swivel base, the entire assembly weighs 4.90 kg (10.80 lbs), while the 130mm by 600mm optical tube weighs just 2.10 kg.
Key Features of Omegon N 102/640 Dobsonian Telescope
Engineered for easy-to-use backyard stargazing, this Omegon N 102/640 Dobsonian telescope combines an f/6.3 Newtonian optical layout with a tabletop rocker base. Its smooth altitude pivot and dual Kellner eyepieces provide high-contrast views across lunar craters and bright deep-sky targets.
- 102mm (4.02 inches) aperture paired with 640mm focal length at versatile f/6.3 speed
- Spherical primary mirror substrate crafted from standard BK7 optical glass
- Standard aluminum optical coatings with protective monoxide overlay layer
- 32mm planar secondary mirror obstruction (31.37% diameter, 9.84% area)
- 1.25-inch standard rack and pinion focuser with manual tension adjustment screw
- Side altitude pivot axis mounted into a wooden tabletop rocker swivel base
- Pre-calibrated red dot pointer finder clamped onto focuser housing shoe
- Kellner 25mm and Kellner 10mm eyepieces included for instant observation
Spherical Newtonian Optics & Rack-and-Pinion Focuser
The 102mm primary mirror and planar secondary reflect light efficiently across an f/6.3 focal layout to minimize optical distortion. Fitted with a 1.25-inch rack and pinion focuser, this Omegon tabletop telescope supports useful visual magnifications from 15x up to 204x.
Wooden Tabletop Rocker Base & Red Dot Pointer Finder
Manual navigation is straightforward with the tabletop Dobsonian mount. The Omegon N 102/640 pivots smoothly on altitude and azimuth axes, allowing stargazers to point and center celestial objects without complicated mount setups. Equipped with a red dot finder and two eyepieces, it provides a dependable entry point for visual astronomy.
- Low-friction wooden tabletop rocker box with side altitude pivot axis
- Pre-calibrated red dot finder scope for intuitive manual target acquisition
- Kellner 25mm and Kellner 10mm eyepieces included for wide and close-up views
Omegon N 102/640 Warranty
The Omegon N 102/640 Dobsonian Telescope includes a 2-year limited warranty against manufacturing and material defects. The complete factory package contains the 102mm spherical Newtonian optical tube assembly, wooden tabletop rocker box base, pre-calibrated red dot pointer finder, 1.25-inch Kellner 25mm eyepiece, and 1.25-inch Kellner 10mm eyepiece.
Omegon N 102/640 Dobsonian Telescope Specs
| Brand | Omegon |
| Full Model Code | Omegon N 102/640 Spherical Newtonian Reflector Dobsonian Tabletop Mount System |
| Country of Origin | Germany (Designed) / China (Manufactured) |
| Optical Design | Newtonian Reflector (Spherical Primary Mirror Layout with Planar Secondary Mirror) |
| Aperture | 102 mm (4.02 inches) |
| Focal Length | 640 mm |
| Focal Ratio | f/6.3 |
| Optical Coatings | Standard Aluminum Coating Treatment with Protective Monoxide Overlay Layer |
| Glass Material | Standard BK7 Optical Glass Substrates |
| Secondary Mirror Obstruction | 32 mm |
| Secondary Mirror Obstruction by Diameter | 31.37% |
| Secondary Mirror Obstruction by Area | 9.84% |
| Resolving Power | 1.14 Arcseconds (Dawes), 1.35 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 11.8 |
| Highest Useful Magnification | 204x |
| Lowest Useful Magnification | 15x |
| Optical Tube Material | Roll-Formed Heavy-Gauge Steel Cylinder Shell with Synthetic End Protective Trim rings |
| Focuser Style & Mechanism | 1.25-inch Standard Rack and Pinion Drive Focuser Array with Manual Tension Adjuster Screw |
| Mirror Lock Mechanism | Yes (Rear Secondary Pull-and-Push Manual Collimation Retention Screws on Mirror Base) |
| Optical Tube Dimensions | 130 mm x 600 mm |
| Optical Tube Weight | 2.10 kg (4.63 lbs) - OTA Only / 4.90 kg (10.80 lbs) - Combined Total Assembly Weight |
| Mount Attachment Type | Side Altitude Pivot Axis Fastened Into Wooden Tabletop Rocker Swivel base |
| Finder Scope Specification | Red Dot Finder Assembly Pre-calibrated and Clamped onto Focuser Housing Shoe |
| Included Accessories | 102mm Spherical Newtonian OTA, Wooden Tabletop Rocker Box, Red Dot Pointer Finder, 1.25-inch Kellner 25mm Eyepiece, 1.25-inch Kellner 10mm Eyepiece |
| Standard Warranty | 2-Year Limited Warranty |
| Application | Easy-to-use manual backyard astronomy tracking deep sky star structures, picking an f/6.3 focal index to organically minimize spherical optical distortion values. |
































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