Skywatcher Skyliner-250PX FlexTube 10 inch Dobsonian Telescope 10157

Sky-Watcher Skyliner 250P FlexTube™ Dobsonian Telescope

254mm (10") f/1200 Collapsible Parabolic Dobsonian Telescope with Low-Expansion Borosilicate Optics

The Sky-Watcher Skyliner 250P FlexTube™ is a high-performance 10-inch Dobsonian telescope designed to deliver exceptional deep-sky and planetary views while offering a practical, collapsible design for easier transport and storage. Built around a large 254mm parabolic primary mirror, it combines serious light-gathering power with Sky-Watcher’s innovative FlexTube™ truss system for improved usability without sacrificing optical quality.

Ideal for advanced amateur astronomers and experienced observers, it provides impressive aperture performance in a more manageable, space-efficient form factor.

Powerful 254mm Parabolic Optics

At the core of the Skyliner 250P is a precision-engineered optical system designed for maximum clarity and light throughput.

Key optical features include:

• 254mm (10") parabolic primary mirror

• 1200mm focal length (f/5)

• Diffraction-limited optical performance

• Low-expansion borosilicate glass construction

• 94% reflective RAQ™ aluminium quartz coatings

Delivers extremely bright, high-contrast views of faint deep-sky objects and planetary detail.

Enhanced Light-Gathering Capability

With a large 10-inch aperture, the 250P offers a significant step up in observational power.

Key benefits:

• 56% more light gathering than a 200mm telescope

• Exceptional performance on galaxies, nebulae, and clusters

• Strong planetary resolution and lunar detail

• Bright, immersive wide-field viewing

A true “light bucket” for serious visual astronomy.

FlexTube™ Collapsible Design

The patented FlexTube™ system improves portability without requiring full disassembly.

Key features include:

• Collapsible truss-tube structure with rigid support poles

• No tools or time-consuming assembly required

• Maintains collimation when extended

• Multiple height positions including binoviewer setting

• Compact storage when retracted

Combines large aperture performance with improved practicality.

Stable Dobsonian Mount System

Designed for smooth manual tracking and simple operation, the Dobsonian base provides intuitive control.

Includes:

• Alt-azimuth rocker box mount

• Low-friction azimuth and altitude bearings

• Smooth manual “push-to” tracking

• Adjustable tension control handles

• Integrated accessory tray

Fast setup with no alignment or electronics required.

High-Precision Optical Engineering

Built to deliver sharp, contrast-rich images across a wide range of targets.

Features include:

• Precisely figured parabolic primary mirror

• Reduced spherical aberration

• Ultra-thin 0.5mm secondary support vanes

• Minimal diffraction spikes

• High-reflectivity multi-layer RAQ™ coatings

Ensures consistently sharp and detailed views.

Thermal Stability & Fast Cool-Down

Designed to reach optimal observing performance quickly and maintain image stability.

Key benefits:

• Low-expansion borosilicate mirror substrate

• Faster thermal equilibration than standard glass

• Reduced image distortion during cool-down

• Stable optical performance in varying conditions

Ideal for quick observing sessions.

Improved Usability & Build Design

The Skyliner 250P is engineered for both performance and practicality in real-world use.

Key design features:

• OTA can be separated from base for transport

• Smooth bearing system for easy movement

• Reinforced 3-point tube locking system

• Steel optical tube assembly

• Integrated carrying handles on mount

Designed for easier handling of a large-aperture telescope.

Included Accessories

The telescope is supplied with a complete observing package:

• 12.5mm and 20mm 70° wide-angle eyepieces

• 2" precision Crayford focuser with adapters

• 9x50 finderscope with crosshair reticle

• Universal smartphone adapter

• 1.25" adapter with brass compression ring

• Direct SLR camera connection support

Ready for immediate visual observation and basic imaging.

Key Features

• 254mm (10") parabolic primary mirror

• 1200mm focal length (f/5)

• FlexTube™ collapsible truss-tube design

• Low-expansion borosilicate glass optics

• RAQ™ 94% reflective mirror coatings

• Dobsonian alt-azimuth mount system

• 2" Crayford focuser included

• 9x50 optical finderscope

• Smartphone and SLR compatibility

• Collapsible OTA for improved portability

• High light-gathering deep-sky performance

Why Choose the Sky-Watcher Skyliner 250P FlexTube™?

The Sky-Watcher Skyliner 250P FlexTube™ offers serious aperture performance in a more practical, collapsible design. With its 10-inch parabolic mirror, advanced FlexTube™ structure, and high-quality optical coatings, it delivers outstanding deep-sky capability and detailed planetary views, making it a powerful choice for experienced visual astronomers seeking maximum performance with improved portability.