SPECIFICATIONS

 

#21076

#21085

Optical System:

Refractor

Refractor

Aperture:

70mm (2.8")

90mm (3.5")

Focal Length:

900mm

1000mm

F/ratio:

f/13

f/11

Focuser

Rack and Pinion

Rack and Pinion

Standard Oculars (or

20mm 1¼" (45x)

20mm 1¼" (50x)

Eyepieces)

10mm 1¼" (90x)

10mm 1¼" (100x)

Resolution

1.7 arc seconds

1.3arc seconds

Light gathering Power

100x unaided eye

165x unaided eye

Limiting Magnitude

11.4

12.3

Highest useful Power

142x

213x

NOTE: Specifications are subject to change without notice.

OPTIONAL ACCESSORIES

You will find that additional accessories enhance your viewing pleasure and expand the usefulness of your telescope. For ease of reference, all the accessories are listed in alphabetical order.

Barlow Lens - A Barlow lens is a negative lens that increases the focal length of a telescope. Used with any eyepiece, it doubles the magnification of that eyepiece. Celestron offers two Barlow lens in the 1-1/4" size. The 2x Ultima Barlow (#93506) is a compact triplet design that is fully multicoated for maximum light transmission and parfocal when used with the Ultima eyepieces. The OMNI Barlow (#93326) is a compact achromatic Barlow lens that is under three inches long and weighs only 4 oz. It works very well with all Celestron eyepieces.

Exotherm (#93504)- Perfect for chilly evenings outdoors camping, stargazing, or at sporting events, the Exotherm hand warmer is convenient, reusable and made from nontoxic materials. Heat lasts up to 1 hour.

Eyepieces - Like telescopes, eyepieces come in a variety of designs. Each design has its own advantages and disadvantages. For the 1-1/4" barrel diameter there are four different eyepiece designs available.

•OMNI Plössl - Plössl eyepieces have a 4-element lens designed for low-to-high power observing. The Plössls offer razor sharp views across the entire field, even at the edges! In the 1-1/4" barrel diameter, they are available in the following focal lengths: 4mm, 6mm, 9mm, 12.5mm, 15mm, 20mm, 25mm, 32mm and 40mm.

•X-Cel- This 6 element design allows each X-Cel Eyepiece to have 20mm of eye relief, 55° field of view and more than 25mm of lens aperture (even with the 2.3mm). In order to maintain razor sharp, color corrected images across its 55° field of view, extra-low dispersion glass is used for the most highly curved optical elements. The excellent refractive properties of these high grade optical elements, make the X-Cel line especially well suited for high magnification planetary viewing where sharp, color-free views are most appreciated. X-Cel eyepiece come in the following focal lengths: 2.3mm, 5mm, 8mm, 10mm, 12.5mm, 18mm, 21mm, 25mm.

16

Page 15 Page 17
Page 16
Image 16
Celestron 70 manual Optional Accessories, #21076 #21085
Page 15 Page 17

70 specifications

The Celestron 70 telescope, specifically the Celestron Astromaster 70, is a popular choice among amateur astronomers and casual stargazers. This telescope is known for its user-friendly design and impressive optical performance, making it suitable for both beginners and those with some experience in astronomy.

One of the most notable features of the Celestron 70 is its 70mm aperture. This size provides ample light-gathering capability, allowing for the observation of celestial objects such as planets, star clusters, and even some of the brighter deep-sky objects. The optical system consists of a refractor design with fully coated glass optics, ensuring bright and clear images.

The Celestron 70 also incorporates a sturdy mount. The manual Altazimuth mount is intuitive and easy to use, making it simple for users to locate and track astronomical objects in the night sky. It is often equipped with slow-motion controls that help with precision tracking. The lightweight design of the telescope allows for easy portability, making it ideal for viewing sessions in various locations, whether in your backyard or at a remote dark-sky site.

Another key technology in the Celestron 70 is its erect image optics, which produce images that are oriented correctly, making it suitable for both astronomical and terrestrial viewing. Users can easily switch between observing the craters of the Moon, the rings of Saturn, or scenic landscapes during the day.

In addition, the Celestron 70 comes with several useful accessories. It typically includes a finderscope that assists users in locating celestial objects, as well as a collection of interchangeable eyepieces to enhance the viewing experience. The included software often provides a great introduction to astronomy, helping users learn about the various constellations and celestial bodies they can observe.

Overall, the Celestron 70 telescope combines affordability with quality, making it an excellent choice for newcomers to astronomy or anyone looking for a reliable scope for casual observation. With its impressive features, robust design, and user-friendly functionality, it caters to the growing interest in stargazing, inviting users of all ages to explore the wonders of the universe. Whether a clear night brings a chance to observe the intricacies of the Moon's surface or distant stars, the Celestron 70 is poised to provide an enjoyable viewing experience.
Top Page Image Contents