The Optron 250mm (about 9.8") Newtonian optical tube with a fast focal ratio of f/4 is perfect for imaging deep sky objects with a digital SLR or a dedicated astronomy camera. The 3.25" Crayford focuser, double hinge mounting rings, 8x50 right finder, and 13" Vixen style dovetail plate make it ready to be attached to your mount and used immediately.

Features:

• 3.25" dual-speed Crayford focuser with 1.25" adapter, iEAF compatible
• BK7 optical glass primary mirror with a protective quartz coating
• 8x50 mm finder
• 13" Vixen style dovetail plate with solid full circumference mounting rings
• Front dust cap

The package includes:

• 10" fast Newtonian optical tube
• 10" optical tube assembly
• 8x50 mm right finder with mount
• Tube mounting rings
• 13" Vixen style dovetail rail
• 2" diameter extension tube, 35 mm length
• Front dust cover

Technical specifications:

• Optical design: Newton
• Clear aperture: 250 mm
• Focal length: 1000 mm
• Focal ratio: f/4
• Focusing: dual-speed Crayford
• External diameter: 30.5 cm
• Telescope weight: 15.5 kg
• Extension tube: 5 cm (2") diameter, 35 mm length