To demonstrate just one of the effects you will see, compare an eye chart when examining your eyes. Cover one eye and read the chart to the smallest line you can see clearly. Now remove the cover over the eye, relax for a few seconds and then examine the chart with both eyes open — you can see more detail than with one eye. In addition, the brain corrects for small defects (aberrations) of the eyes when given the information from both eyes.

Beyond a 50 foot distance, pupils are nearly parallel and prevent real stereoscopic viewing. However, since our brain "knows" (due to near distance experience), we identify distant objects as three dimensional. The more experienced the observer, the more this effect will be apparent.

The optics are precision aligned and MgF₂ coated. Interpupillary adjustment reaches from 53mm to 76mm. The optical head has a 60° viewing angle for a comfortable viewing position. Full 360° head rotation is provided, together with 2" sleeve and 1¼" drawtube to fit 2" Focuser and 1¼" Visual Backs of all Schmidt-Cassegrains — and also Focusers of Refractors.

The removable 1¼" drawtube features a camera T-2 thread on the Binocular side and 1¼" Filter Thread on the entrance side, to accept Celestron 1¼" Eyepiece Filters. Utilizes 1¼" eyepieces (not included). Must use two eyepieces of equal focal length and design type. Made in Germany.