The two eyepiece ports can be used in another way. With an optional camera adapter and appropriate T-ring a 35-mm SLR camera body can be attached to the rear eyepiece port. The 45º diagonal prism must first be removed. With an eyepiece in the top eyepiece port and a camera body attached to the rear eyepiece port a subject can be observed with the eyepiece. Then by simply adjusting the flip mirror, a picture can be taken through the rear eyepiece port.

FOCUSING FOR ALL VIEWING IS ACCOMPLISHED BY SLOWLY TURNING THE RUBBERIZED WHEEL LOCATED AT THE RIGHT REAR OF THE MAIN OPTICAL UNIT. IF THE IMAGE SEEN IN THE EYEPIECE IS IN FOCUS, THE IMAGE SEEN BY THE CAMERA WILL ALSO BE IN FOCUS.

ABOUT MAGNIFICATION

The magnification power of a telescope indicates how much an image is enlarged or how big and close it appears to the viewer. The focal length of the eyepiece, combined with the focal length of the telescope, determines the magnification power. To calculate the power of your telescope with any particular eyepiece, simply divide the focal length of the telescope (1,200 mm) by the focal length of the eyepiece (indicated in “mm” on the eyepiece collar).

Example:

1200-mm focal length (tube)

= 48X magnification power

 

25-mm focal length (eyepiece)

 

The following magnification values are achieved when using the Barlow lens and the interchangeable eyepieces:

Eyepiece

Power

Power With 3X Barlow Lens

25 mm

48X

144X

9 mm

133X

400X

Higher magnification powers can be achieved by using the included 3X Barlow lens. The 3X Barlow lens is inserted between the telescope and the eyepiece. In Fig. 20 it is shown being used at the rear eyepiece port. It can be used at either eyepiece port.

(Fig. 20)

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National Geographic NG90EQ owner manual About Magnification, Eyepiece Power Power With 3X Barlow Lens
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NG90EQ specifications

The National Geographic NG90EQ is a premium-quality, fully-equipped equatorial telescope that provides amateur astronomers and enthusiasts with an exceptional viewing experience. This powerful telescope is ideal for both planetary observation and deep-sky tracking, making it a versatile addition to any stargazer's collection.

One of the standout features of the NG90EQ is its impressive 90mm aperture. This large lens collects ample light, allowing for bright and detailed images of celestial bodies. With a focal length of 900mm, the telescope offers a focal ratio of f/10, which is well-suited for high-magnification observation. This design ensures that users can easily spot planets like Jupiter and Saturn, as well as a variety of stars and nebulae.

The NG90EQ is equipped with an equatorial mount, an essential component for tracking celestial objects as they move across the night sky. This mount allows users to precisely align the telescope with the North Star, simplifying the process of finding and following planets and stars. The included setting circles further assist in locating astronomical objects, making it easier for newcomers to explore the night sky.

Another notable characteristic of the NG90EQ is its user-friendly design. The telescope features an adjustable, ergonomic tripod that provides stability and supports easy height adjustment. With an optical finderscope, users can quickly locate objects before zooming in with the main telescope. The scope also includes high-quality eyepieces, offering multiple magnification options for varied viewing experiences.

Durability is a key aspect of the NG90EQ, as it is built with robust materials that withstand regular use. Its compact design makes it portable, perfect for taking to dark sky locations away from city lights. The telescope's ease of assembly means that novice astronomers can set it up in a matter of minutes, encouraging exploration and learning.

In summary, the National Geographic NG90EQ telescope stands out due to its excellent optical performance, user-friendly features, and sturdy construction. With its equatorial mount and quality optics, this telescope is perfect for discovering the wonders of the universe, making it a fantastic choice for both beginners and seasoned astronomers alike.
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