William Optics Binocular telescope attachment ''BinoViewers'' with accessory package

Manufacturer's product description:

Choosing between an expensive high-end bino-viewer or monocular attachment for observing? Now, you can also enjoy the benefits of coated BAK4 bino-viewers with your refractor, Schmidt-Cassegrain or Newtonian telescope.

A comprehensive package including:

• 1.25'' bino-viewer attachment with protective compression rings

• 2x W.A. (66 deg.) 20mm eyepieces

• Barlow lens (1.6X) for easier focusing with any telescope

• coating: BaK-4 fully multi-coated

• IP distance adjustment: 53mm to 75mm

• aperture: 20.2mm

• eyepiece holder: helical focusing, compression rings

• size: 120mm x 112mm x 42mm

• optical Path: 100mm (4")

• weight: 520g (without eyepieces)

Our expert comment:

For observing with bino-viewers, you always need two eyepieces of equal focal length. The William Optics Binocular set already includes two quality eyepieces of 20mm focal length.