Meade ETX-70AT instruction

Fig 20: #773 Hard Carry Case.

Fig 21: #64ST T-Adapter.

Fig 22: #827 Right-Angle Viewfinder.

#3200 Lunar & Planetary Color Filter Set: Meade optical glass color filters increase image contrast and resolution of the Moon and planets. The #3200 Set includes light yellow, very light red, very light blue, and neutral density filters. Each filter threads into the barrels of all Meade MA, PL, and WA eyepieces and is packed in a separate plastic case for secure storage.

#773 Hard Carry Case: For secure portability in the field, the #773 Hard Carry Case (Fig. 20) is fully lined with fitted foam inserts and accepts the complete ETX-60AT or ETX-70AT Astro Telescope, plus optional accessories. In order for the telescope to fit in its optional Hard Carry Case, the telescope’s objective lens must be fully retracted.

#64ST T-Adapter:The #64ST T-Adapter (Fig. 21) is the basic means of photography through the ETX-60AT or the ETX-70AT. Attach the #64ST T-Adapter to the rear cell of the telescope, followed by a T-Mount appropriate to your 35mm camera body, and the ETX-60AT or ETX- 70AT is a supertelephoto lens of 350mm focal length. See “PHOTOGRAPHY WITH THE ETX,” page 23.

#827 8 x 25mm Right-Angle Viewfinder and Bracket: For easy sighting of terrestrial or astro- nomical objects prior to their observation in the main telescope, the #827 8 x 25mm Right- Angle Viewfinder (Fig. 22) displays a wide 7.5° field of view. Includes a crosshair eyepiece and precise helicoid focusing; the included viewfinder bracket attaches to the main telescope in seconds.

#933 45° Erecting Prism: The ETX-60AT or ETX-70AT includes an internal optically-flat mir- ror to reflect light to the telescope’s 90° astronomical observing position. In this position, the telescope’s image is upright, but reversed left for right. For terrestrial observing with the ETX- 60AT or ETX-70AT, the #933 45° Erecting Prism (Fig. 23) results in a fully correctly oriented image and a convenient 45° observing angle. The #933 Prism threads on to the telescope’s photo port (16, Fig. 1). An eyepiece of any focal length (magnifying power) may be inserted into the #933 Prism. The #933 includes an internal relay lens which increases each eyepiece power by 2.4x. Note that the flip-mirror control (15, Fig. 1) must be in the “down” position (Fig. 2b) for use with the #933 Prism.

IMPORTANT NOTE: In the most discriminating applications, such as in observing delicate bird feather structure at long distance, the telescope’s internal, optically- flat mirror yields a higher-resolution image than is possible with any prism, includ- ing the #933. In these special cases, users are advised to observe with the eye- piece in the standard 90° eyepiece-holder (15, Fig. 1), with the flip-mirror control in the “up” position (Fig. 2a). This admonition applies only to situations requiring extraordinarily high optical resolution where the observer’s eye is well-trained to observe very fine detail. In typical terrestrial applications, no image differences between the two eyepiece locations can generally be noted.

#670 Dew Shield: In moist climates, water in the atmosphere may condense on the tele- scope’s lens. Dew formation may be reduced significantly by the addition of a #670 Dew Shield (Fig. 24), which threads into the front cell of the telescope.

Fig 23: #933 Erecting Prism.

Fig 24: #670 Dew Shield.

Fig. 25a: #882 Standard Field Tripod set in Alt/Az Configuration.

Fig 25b: #883 Deluxe Field Tripod set in Polar Configuration.

Tripods: Manufactured of strong, lightweight extruded aluminum, the #882 Standard Field Tripod (Fig. 25a) and the #883 Deluxe Field Tripod (Fig. 25b) allow standing or seated observations. The heights of both tripods are continuously adjustable from 34” to 54”. Micrometric controls in both azimuth and ele- vation-angle of the #883 Deluxe Field Tripod permit precise Polar Alignment of the tele- scope’s fork mount for advanced astronomical applications. When Alt/Az Alignment of the tel- escope is desirable, the tripod head of the #883 tilts and locks at 90°. Both tripods include all the rigidity and stability required for high- power observing through the telescope.

26 Optional Accessories

ETX-70AT specifications

The Meade ETX-70AT is a compact, portable telescope that caters to both amateur astronomers and educational purposes. This telescope is part of the renowned ETX series, known for its innovative features and user-friendly design. With an aperture of 70mm, the ETX-70AT is designed to provide clear, bright images of celestial objects, making it an ideal choice for novice astronomers eager to explore the night sky.

One of the standout features of the ETX-70AT is its Maksutov-Cassegrain optical design. This design combines a Maksutov corrector plate with a compact cassegrain layout, allowing for a shorter tube length while still providing excellent optical performance. As a result, users can easily transport the telescope to various observing locations without compromising on image quality.

The telescope boasts a focal length of 350mm, which offers a wide field of view, allowing observers to comfortably locate and track celestial phenomena. The ETX-70AT comes equipped with a built-in electronic control system known as the Audio Star, featuring a database of over 30,000 celestial objects. This system not only makes it easier for users to locate specific targets but also enhances the overall observing experience by providing informative audio commentary about different astronomical objects.

Another notable characteristic is its lightweight design, weighing in at just around 5 lbs. This portability factor makes it an excellent choice for stargazers who prefer to travel or hike to optimal viewing locations. The telescope is mounted on an adjustable and stable aluminum tripods, providing a solid foundation for viewing.

The Meade ETX-70AT also includes a variety of accessories, including two eyepieces (26mm and 9.7mm), a finder scope to help users aim accurately, and a variety of optional filters to enhance viewing contrast and clarity. Furthermore, the telescope supports direct connection to a computer for astrophotography, enabling enthusiasts to capture their astronomical observations digitally.

In summary, the Meade ETX-70AT is an exceptional entry-level telescope that combines portability, advanced technology, and ease of use. With its powerful optics, automated features, and impressive accessory offerings, it serves as an excellent tool for any individual or educational institution looking to delve into the wonders of astronomy.