Under the best sky conditions, you’ll pick out objects as faint as 12th magnitude. The combination of the 14mm eyepieces and 100mm objective lenses gives a 1.75° field of view, equivalent to three and a half Full Moons side by side. This allows you to hold your eyes slightly away from the eyepieces to view in comfort. Each eyepiece has an exit pupil of 2.5mm and 18mm of eye relief. Two Oberwerk 14mm eyepieces (which normally cost $250 per pair) come with the BT-100XL-ED to provide a magnification of 40x. Remember that you are, in fact, using side-by-side short-focal-length telescopes. The result is an incredibly sharp image.įor these (or any other) binoculars to work, you must use matched eyepieces. This material assures little color separation, or chromatic aberration, as all the wavelengths of visible light pass through the objective lenses. The binoculars have FK61 ED doublet lenses made of fluorite with extra-low light dispersion, hence the ED notation. Obviously, these binoculars are too large and heavy to hold, so Oberwerk sells several tripods that can be used with them. This feature is not available on many astronomical binoculars. A mounting rail on top can be used with a laser pointer to quickly locate celestial objects. The binoculars are about 21 inches (53.3 centimeters) long and weigh 12.5 pounds (5.7 kilograms). The finishes are applied to a magnesium alloy body that has an absolutely flawless finish. That’s like having two wide-field 4-inch telescopes strapped together! I received the Luna Pearl-finished binoculars, but they also come in Big Eye Gray. The BT-100XL-ED Binocular Telescope features 100mm objective lenses. Indeed, viewing through these giants is a dream. As a result, viewing with Oberwerk’s BT-100XL-ED gives a fantastic feeling of swimming through space. And the bigger they are, the better suited they are for astronomical work. Binoculars are a great way to solve this problem. When we observe through a telescope with just one eye, we lose depth, and the sky looks “flat.” Observing with both eyes through matching eyepieces restores this depth of field. This lets us see in 3D, providing a sense of depth to our vision. Our eyes are separated by a few centimeters. But the best solution is to observe with both eyes using matching eyepieces. In a less-than-perfect situation, I use an eyepatch for that pirate look we all love. This works well if there is no ambient light. Long ago, I learned to observe with both eyes open while using only one eye to look through the eyepiece. Please know that ALL PRICES AND AVAILABILITY ARE SUBJECT TO CHANGE WITHOUT NOTICE the price initially quoted for a telescope purchase may not be reflected in the final invoice.As with all personal telescope users, I often find myself squinting into an eyepiece to view some celestial wonder. Furthermore, cancellations of a BINO order may incur additional fees prior to a refund. Please note that Binocular telescopes require at least double the deposit, because it comprises two telescopes. If you would like to purchase a BINO telescope, please specify in the comments in the order form and select to purchase two telescopes of the same size. BINOs are essentially custom orders made to your specifications and require specialized construction and adapters. Due to the fact that a BINO comprises two of the same model, BINO telescopes are considered special orders and require specification when making the initial order. When ordering a BINO, it is important to consider the mount load capacity and any additional accessories required for the dual mounting. The light and slender Tube Assembly has nice balance and a wider variety of mount options. The APO140FL F/7 is especially suited for dual viewing of the night sky. TEC can construct any TEC telescope model into a “BINO” as long as two of the same model have been ordered and the order specifies that it is for a Binocular Setup. This expands the range of view and adds extra comfort for the viewer. Binocular Telescopes comprise two telescopes of the same size paired on a single mount.
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