Do you have a question about the SKY-WATCHER CLASSIC 250P DOBSONIAN and is the answer not in the manual?
Aligning the finderscope with the main telescope for accurate object targeting.
Achieving a sharp image by adjusting the focuser, often requiring fine-tuning.
Enhancing magnification with a Barlow lens, affecting field of view and eye relief.
Adjusting friction to allow smooth tube movement while maintaining stable positioning.
Guiding the telescope via altitude and azimuth to locate celestial objects accurately.
Determining telescope magnification by dividing telescope focal length by eyepiece focal length.
Calculating the true field of view using apparent field and magnification values.
Assessing light reaching the eye by dividing primary mirror diameter by magnification.
Understanding 'seeing' (air steadiness) and 'transparency' (air clarity) for optimal viewing.
Selecting a dark, accessible, and elevated location away from light and pollution.
Identifying optimal times for viewing, often early morning, for stable air and less light.
Allowing the telescope to reach ambient temperature for clear, undistorted images.
Dark-adapting eyes to red light and using averted vision for better faint object observation.
Aligning telescope mirrors for optimal image focus and performance.
Adjusting the secondary mirror using alignment screws for proper light path.
Adjusting the primary mirror using screws to ensure optical alignment.
Properly cleaning optical surfaces, finderscope, and eyepieces with care.
Critical warning against direct sun viewing to prevent permanent eye damage.
Aligning the finderscope with the main telescope for accurate object targeting.
Achieving a sharp image by adjusting the focuser, often requiring fine-tuning.
Enhancing magnification with a Barlow lens, affecting field of view and eye relief.
Adjusting friction to allow smooth tube movement while maintaining stable positioning.
Guiding the telescope via altitude and azimuth to locate celestial objects accurately.
Determining telescope magnification by dividing telescope focal length by eyepiece focal length.
Calculating the true field of view using apparent field and magnification values.
Assessing light reaching the eye by dividing primary mirror diameter by magnification.
Understanding 'seeing' (air steadiness) and 'transparency' (air clarity) for optimal viewing.
Selecting a dark, accessible, and elevated location away from light and pollution.
Identifying optimal times for viewing, often early morning, for stable air and less light.
Allowing the telescope to reach ambient temperature for clear, undistorted images.
Dark-adapting eyes to red light and using averted vision for better faint object observation.
Aligning telescope mirrors for optimal image focus and performance.
Adjusting the secondary mirror using alignment screws for proper light path.
Adjusting the primary mirror using screws to ensure optical alignment.
Properly cleaning optical surfaces, finderscope, and eyepieces with care.
Critical warning against direct sun viewing to prevent permanent eye damage.
| Focal Length | 1200mm |
|---|---|
| Focal Ratio | f/4.7 |
| Mount Type | Dobsonian |
| Highest Practical Power | 500x |
| Limiting Stellar Magnitude | 14.7 |
| Resolution | 0.46 arc seconds |
| Tube Material | Steel |
| Aperture | 254mm |
| Optical Design | Reflector |
| Eyepieces Included | 10mm & 25mm |
| Finder Scope | 9x50 |
| Tube Dimensions | 1200 mm |











