Oculare Zoom Sky Watcher 7-21mm (31,75)

The Sky-Watcher 7-21mm Zoom Eyepiece is a versatile eyepiece that allows you to cover all focal lengths from 7mm to 21mm in one single eyepiece. This makes it ideal for astronomers and terrestrial observers who want to travel light and not be burdened with their entire range of classic eyepieces.

It's particularly well-suited to small portable binoculars, like the 80/400 which it converts into a genuine terrestrial long-range viewing instrument. The Zoom Eyepiece is threaded at 1.25" (31.75mm), its focal length varies by rotating part of the eyepiece on itself.

Characteristics

• Thread: 31.75mm
• Apparent Field: 30° (at 21mm) - 43° (at 7mm)
• Weight: 164g
• External Diameter: 40mm
• Eyepiece Relief: 17 (at 21mm) - 19mm (at 7mm)

All lenses are multi-coated. Good grip thanks to a rubberized rim. Anti- stray light bonnet included. Like most eyepieces, it's compatible with 31.75mm filters due to the presence of threading.