EasyManua.ls Logo

SKY-WATCHER CLASSIC 250P DOBSONIAN - User Manual

SKY-WATCHER CLASSIC 250P DOBSONIAN
12 pages
Print Icon
To Next Page IconTo Next Page
To Next Page IconTo Next Page
Loading...
INSTRUCTION MANUAL
150mm/1200mm
200mm/1200mm
254mm/1200mm
DOBSONIANS
Question and Answer IconNeed help?

Do you have a question about the SKY-WATCHER CLASSIC 250P DOBSONIAN and is the answer not in the manual?

Summary

Telescope Operation

Finderscope Alignment

Aligning the finderscope with the main telescope for accurate object targeting.

Focusing the Image

Achieving a sharp image by adjusting the focuser, often requiring fine-tuning.

Using a Barlow Lens

Enhancing magnification with a Barlow lens, affecting field of view and eye relief.

Tension Control Handle

Adjusting friction to allow smooth tube movement while maintaining stable positioning.

Pointing the Dobsonian Telescope

Guiding the telescope via altitude and azimuth to locate celestial objects accurately.

Calculating Magnification

Determining telescope magnification by dividing telescope focal length by eyepiece focal length.

Calculating Field of View

Calculating the true field of view using apparent field and magnification values.

Calculating Exit Pupil

Assessing light reaching the eye by dividing primary mirror diameter by magnification.

Observing the Night Sky

Understanding Sky Conditions

Understanding 'seeing' (air steadiness) and 'transparency' (air clarity) for optimal viewing.

Choosing an Observing Site

Selecting a dark, accessible, and elevated location away from light and pollution.

Best Time for Observation

Identifying optimal times for viewing, often early morning, for stable air and less light.

Telescope Cooling

Allowing the telescope to reach ambient temperature for clear, undistorted images.

Eye Adaptation for Viewing

Dark-adapting eyes to red light and using averted vision for better faint object observation.

Telescope Care and Maintenance

Collimation Procedure

Aligning telescope mirrors for optimal image focus and performance.

Secondary Mirror Alignment

Adjusting the secondary mirror using alignment screws for proper light path.

Primary Mirror Alignment

Adjusting the primary mirror using screws to ensure optical alignment.

Cleaning Telescope Optics

Properly cleaning optical surfaces, finderscope, and eyepieces with care.

Critical Safety Warning

Sun Viewing Hazard

Critical warning against direct sun viewing to prevent permanent eye damage.

Summary

Telescope Operation

Finderscope Alignment

Aligning the finderscope with the main telescope for accurate object targeting.

Focusing the Image

Achieving a sharp image by adjusting the focuser, often requiring fine-tuning.

Using a Barlow Lens

Enhancing magnification with a Barlow lens, affecting field of view and eye relief.

Tension Control Handle

Adjusting friction to allow smooth tube movement while maintaining stable positioning.

Pointing the Dobsonian Telescope

Guiding the telescope via altitude and azimuth to locate celestial objects accurately.

Calculating Magnification

Determining telescope magnification by dividing telescope focal length by eyepiece focal length.

Calculating Field of View

Calculating the true field of view using apparent field and magnification values.

Calculating Exit Pupil

Assessing light reaching the eye by dividing primary mirror diameter by magnification.

Observing the Night Sky

Understanding Sky Conditions

Understanding 'seeing' (air steadiness) and 'transparency' (air clarity) for optimal viewing.

Choosing an Observing Site

Selecting a dark, accessible, and elevated location away from light and pollution.

Best Time for Observation

Identifying optimal times for viewing, often early morning, for stable air and less light.

Telescope Cooling

Allowing the telescope to reach ambient temperature for clear, undistorted images.

Eye Adaptation for Viewing

Dark-adapting eyes to red light and using averted vision for better faint object observation.

Telescope Care and Maintenance

Collimation Procedure

Aligning telescope mirrors for optimal image focus and performance.

Secondary Mirror Alignment

Adjusting the secondary mirror using alignment screws for proper light path.

Primary Mirror Alignment

Adjusting the primary mirror using screws to ensure optical alignment.

Cleaning Telescope Optics

Properly cleaning optical surfaces, finderscope, and eyepieces with care.

Critical Safety Warning

Sun Viewing Hazard

Critical warning against direct sun viewing to prevent permanent eye damage.

SKY-WATCHER CLASSIC 250P DOBSONIAN Specifications

General IconGeneral
Focal Length1200mm
Focal Ratiof/4.7
Mount TypeDobsonian
Highest Practical Power500x
Limiting Stellar Magnitude14.7
Resolution0.46 arc seconds
Tube MaterialSteel
Aperture254mm
Optical DesignReflector
Eyepieces Included10mm & 25mm
Finder Scope9x50
Tube Dimensions1200 mm

Related product manuals