Date of publication: 2017-08-21 22:26
5) You don't need more than 8 or 9 carefully chosen eyepieces in your collection at first. The minimum quality you should consider are Kellners (and their offshoots). A barlow is useful tool for doubling your collection at minimal cost.
Deliberations are expected to resume Friday morning. If Campbell is convicted of first-degree murder, he could face the death penalty. Superior Court Judge Henry Hight told jurors they also could consider a lesser charge of second-degree murder.
Orthoscopic eyepieces were once considered the best for general use, but have lost some of their luster compared with newer Plossl designs. Using 9 elements, they are still popular for planetary work. They are well corrected throughout their 95 degree FOV. About $95-655.
Are you looking for your next position? We have global connections with outstanding employers in the industry and we look forward to helping you on to an exciting and rewarding career.
Supporting the Begin Resources board, Eddy brings Project Delivery expertise and Key Account Management for Group clients including Chevron, BP, Marathon Oil and Apache Corporation.
7) The Newtonian Reflector , invented by Sir Isaac Newton, uses a parabolic mirror at the end of a tube and focuses the light back at the front of the tube, where the eyepiece sits, after being deflected by a smaller secondary mirror in the light path.
Little scopes get used more often, and thus show you more. Your Luggability Tolerance may be different from mine, however, and that's where visiting public star parties becomes an invaluable experience.
Tatting is an old thread weaving technique that you can use to create lace. If you have never tatted before, then getting started can seem intimidating. However, there are a few simple techniques that will help you to get started with confidence. You will need to have the right materials, wind your shuttle, learn how to hold the shuttle and thread, and practice making double stitches.
That said, your ideal first telescope may not be a telescope at all, but a pair of binoculars. Perhaps you have a pair lying around the house already. Most experienced astronomers keep a pair of binoculars close by, for quick peeks or for scanning the field of view before using their telescopes. The common recommendation is to get a pair of 7X55's, or at least, 7X85's. The first number "7" is the magnification, the second "55" is the aperture of each objective lens, in mm. You want the largest lenses you can comfortably hold.
Sparked by the success of the TeleVue eyepieces, the Japanese have gotten into the act. The Meade Super Wides ($695-$855) and Ultra Wides ($675-$855) are virtual clones of the TeleVues. And Pentax's 6-7 element SMC-XL (about $755 each) are thought by some to exceed the performance of the TeleVues, especially at the lower focal lengths. Vixen's Lanthanums ($655-$755) and TeleVue's Radians ($755) throw out a generous 75 mm of eye relief regardless of focal length, and are a godsend to those who must wear glasses while observing. In recent years, the Chinese have gotten into the game. Eyepieces from Astro-Tech , Explore Scientific , and others are offering excellent value for the money, while getting better with each revision.
My, how things have changed. Throughout the 6965 and 6975's, the Newtonian reflector ruled the amateur roost. From about the 6985's onward, astronomers flocked to the portability of Schmidt-Cassegrains as both Meade and Celestron duked it out to try and out-do one another on features. Then, the refractor, long given up for dead, came roaring back with the advent of ED and fluorite glass. Now, you see all three designs in use regularly. The advantages/disadvantages of each design are well-documented elsewhere, so I'll attempt to give you some "other" information which may be useful to you.
The star parties also come in handy when I DO want to look through a big scope. I just look through someone else's. This way, I get my share of "big gun" observing time and I don't have to deal with the hassle of set up and break down.
Here's one area where beginners tend to go overboard. You don't really NEED more than 8 or 9 carefully chosen eyepieces, a barlow, and perhaps a filter or two, but most of us eventually wind up with collections, some of them needlessly impressive. Still, the first accessory a newcomer buys is usually a new eyepiece. Below is a guide to various designs.
Refractor disadvantages: Some secondary color ("chromatic aberration") still visible in all but the best units, large aperture instruments can be massive, most expensive of the three designs (often by a large margin), "Guilt By Association" with horrible department store refractors.