![SPECIFICATIONS](/images/new-backgrounds/102265/10226531x1.webp)
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
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
•OMNI Plössl - Plössl eyepieces have a
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