Sky-Watcher Quattro 250P Imaging Newtonian 10" (254 mm)

An f/4 Imaging Newtonian

Sky-Watcher presents the fast f/4 focal ratio as especially important for astrophotographers working with long exposures. It notes that imaging telescopes made of less thermally stable material can drift from best focus during long exposures, and says the Quattro stays in focus for longer.

The tube interior has knife-edge, ray-traced baffles. The highest practical power is 508x.

Paraboloidal Mirror and Thin Secondary Supports

The paraboloidal primary mirror is made of low-expansion borosilicate glass, which gives substantially shorter cool-down times.

The secondary mirror is 89mm, on 0.5 mm ultra-thin secondary mirror supports.

Coma Corrector and What Is Not Included

No coma corrector and no eyepiece are included. For the Quattro series, a high-quality coma corrector is an essential accessory for wide-field astrophotography, and the telescopes also give nice visual images without one.

A 2" to 1.25" eyepiece adapter is included.

2-Inch Dual-Speed 10:1 Linear Power Focuser

Four precision ball bearings support the drawtube, giving stability and zero image shift with a heavy eyepiece or camera.

A roller moves the drawtube instead of a rack and pinion, and a second knob with a 10:1 reduction gives super-fine adjustments.

15.1 kg Tube, Rings and Dovetail

The tube weighs 15.1 kg (33.3 lb) and measures 25.75 cm by 73 cm (skywatcher.com). It is supplied with a pair of tube rings and a V-style dovetail plate.

The AZ-EQ6 Pro and EQ6 Pro are related mounts. Choose a mount with a Vixen-style saddle and a payload rating that covers the tube plus your camera and accessories.

Solar Safety

Never point the telescope or its finder at the Sun without a proper solar filter securely covering the front of the telescope: looking at the Sun through it will cause permanent eye damage.