Astro Optics 25mm Economy .965″ Telescope Eyepiece
Saturday, February 13th, 2010 at
3:45 am
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Astro Optics 25mm Economy .965" Telescope Eyepiece
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US $8.99 End Date: Saturday Feb-13-2010 19:00:56 PST Buy It Now for only: US $8.99 Buy it now | Add to watch list |
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US $.99
Assuming that the telescope is of high quality construction, and that the atmospheric conditions are perfect for observations, then the resolution is limited by diffraction.
Light passing through the lens interferes with itself creating a ring-shaped diffraction pattern, known as the Airy pattern, if the wavefront of the transmitted light is taken to be spherical or plane over the exit aperture. The result is a blurring of the image. An empirical diffraction limit is given by the Rayleigh criterion invented by Lord Rayleigh:
The images of two different points are regarded as just resolved when the principal diffraction maximum of one image coincides with the first minimum of the other. If the distance is greater, the two points are well resolved and if it is smaller, they are not resolved. Mathematically, this translates into:
D=1.220 x w/sin r
Where D is the diameter of the main mirror or lens
w is the wavelength of the light
r is the resolution required in radians
In this case we have:
w = 5000 Angstroms
r = 0.4 arc seconds = 0.000111111 degrees = 1.93925 x 10^-06 radians
sin r = 1.93925 x 10^-06 radians
Therefore
D= 1.220 x 5000 / 1.93925 x 10^-06 Angstroms
D = 3,145,538,295 Angstroms
D = 31.46 centimeters
or about 12 inches.
wow 12-13 second burst? sick.
建玉評価損益通知, 売買:買, 建玉レート:140.649, 評価損益:3170, 現在日時:2010/02/16 15:07:16, 現在BIDレート:140.965, 現在ASKレート:140.993
A diverse cast of cosmic characters is showcased in the first survey images NASA released Wednesday from its Wide-field Infrared Survey Explorer, or WISE. Since WISE began its scan of the entire sky in infrared light on Jan. 14, the space telescope has beamed back more than a quarter of a million raw, infrared images. Four new, processed pictures illustrate a sampling of the mission’s targets — a wispy comet, a bursting star-forming cloud, the grand Andromeda galaxy and a faraway cluster of hundreds of galaxies. “WISE has worked superbly,” said Ed Weiler, associate administrator of the Science Mission Directorate at NASA Headquarters in Washington. “These first images are proving the spacecraft’s secondary mission of helping to track asteroids, comets and other stellar objects will be just as critically important as its primary mission of surveying the entire sky in infrared.The gallery of newly released images
In some sort of effort to re-kindle the flames of the dying Plasma species of TV’s LG has launched two new models – the 60PK550 is a 60-inch HDTV and the 50-Inch 50PK550. The two models have been dubbed “Skinny Frame” for rather literal reasons. Both TVs have a 25mm thin border around the panels. This full HD TVs feature 600Hz technology and automatic contrast adjustment that adjust the levels depending on the available light. They will also come…
NASA: RT – Rio de Janeiro, Brazil. Did I miss the carnival?
In a unanimous vote, the Sacramento City Council voted Tuesday in a closed-door session to appoint a temporary replacement for outgoing City Manager Ray Kerridge. Assistant City Manager Gus Vina will take on the role of acting city manager at noon Friday, Mayor Kevin Johnson said upon emerging from nearly two hours of meetings. Vina will hold the position for 30 days while the council looks for an interim city manager. That interim post likely will stay in place for the remainder of the year while the city searches for Kerridge’s permanent replacement. Johnson said appointing Vina as acting city manager “allows us to steady the ship a little quicker.” He said it would be difficult for the council to get an interim city manager in place before Kerridge works his last day March 12. Kerridge, frustrated by the sour economy and a fractured City Council, announced last week he was leaving his $215,000-a-year job for a position in the private sector. The council appeared anything but…
nice stuff!!
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Of course there is climate change because the Earth is a changing system, ever hear of the ice age, 10,000 years ago most of America was covered with 100 mile high ice, Man is not causing anything, how interesting the talk of taxes on Carbon is, wake up
canadian might
Too bad the flip mino doesn’t have zoom to eliminate vignetting
Hamilton wanted the U.S. to have a commercial and industrial economy, as opposed to the agricultural economy favored by the southern states and settlers in the west.
One reason he thought this was important was that he believed the U.S. would have to defend itself, and that an industrial base would provide a means to do so. He also was a disciple of Adam Smith and believed that commerce and industry would help preserve liberty more than than would a slave-based economy.
He thought that the U.S. had to repay the debts run up by the Continental Congress or no one would ever loan money to the U.S. So he was in favor of paying the war debts. He also favored protective tariffs to shelter the developing industries, and a strong federal government including a central bank.
ok, you could have asked this in the astronomy & space forum too – but it's ok in Physics…
The magnification of a telescope is given by
M = -Focal_length_of_scope / Focal_length_of_eyepiece. So we can rearrange this to be
-M*5mm = Focal_length_of_scope = 225*5 mm = 1125mm
To work out the total length of the scope remember that the focal lengths of the eyepiece and scope are added together – so you could expect it to be about 1130mm long.
hth
NUMA NUMA NEYYY
RAEN Optics 2010
i answered other question from yourself.if you keep question open i will find out trade name for you tomorrow,i know a guy who fits the stuff but only in Scotland.i will answer question again tomorrow.
To replace the regular copper underground cable for fiber optics is very expensive for the companies , feel lucky if you have the regular cable system.
23 Nisan Ulusal Egemenlik ve Çocuk Bayramı onuruna başlatılan Ülker Çocuk Sineması Şenliği bu yıl da gerçekleşiyor. Şeklik kapsamında bu yıl çocuklara, David Bowers’un yönettiği “Astro Boy” gösterilecek.
Gourmet #4: Pampers Swaddlers, Size 2-3 (14-22 Lbs), Economy Plus Pack, 152 Swaddlers
Michael Tsarion — Red Ice Interview 11-20-09 Part 3/11 ‘We have Michael Tsarion with us for a two-hour discussion about Conspiracy and Psychology. We discuss Man and his Psychic Epidemics, the roots of tyranny and comment on Alex Jones latest film “Fall of the Republic.” Michael is behind the “Origins and Oracles” DVD series. He i also the author of “Atlantis, Alien Visitation and Genetic Manipulation,” “Irish origins of Civilization” and “Astro-Theology & Sidereal Mythology.” Michael Tsarion, Red Ice Creations and Blue Fire Film are also the producers of the Architects of Control DVD series. We discuss conspiracy and solutions, the con of the American Constitution and the source of Tyranny. Topics Discussed: Consciousness, Man and his Psychic Epidemics, identification, governments, fascists, the masses, solutions, escape, religion, christianity, psychopaths, fraternal societies, kindergartens for psychopaths, Alex Jones, Alan Watt, G Edward Grifin, The New World Order, The Royals,…
aweeesome electric
I use the Jose Eber and it is amazing. It heats up in seconds and in my hair (which usually is unable to be curled) curls last overnight sometimes without any hairspray.
The curling iron you purchased has a retail price of $199. I know you can get it off of ebay for about $50, and it is definitely worth the high price.
I get compliments all the time and wouldn't go with another curling iron at all.
i dunno what i would be categorized. I don’t like to label myself under any of those positions. but if you are asking if i follow with the ideology then no. but im really curious as to why you have to wonder whether i am a social darwinist. please do explain.
You know that a trend is ramping up when big companies begin to namecheck it. That’s what is happening to the Internet of Things, an emerging trend where real-world objects are connected to the Internet. Senior executives from two major U.S. broadband and telecommunications companies – Verizon and AT&T – plus the CTO of the world’s biggest network systems provider Cisco, have recently discussed the Internet of Things. As part of a patriotic statement about how the U.S. leads the world in Internet innovation, Verizon chairman and CEO Ivan Seidenberg said today that the “‘Internet of Things’ will infuse intelligence into all our systems and present us with a whole new way to run a home, an enterprise, a community or an economy.” Sponsor Seidenberg said that “in a 4G world, wireless will connect everything” and that “there’s really no limit to the number of connections that can be part of the mobile grid: vehicles, appliances, buildings, roads, medical monitors.” AT&T have also been…
Out client is an automotive component supplier and they work with all major OEMs, and they now have an opening for an Optical Design Engineer, suitable for a graduate or of equivalent optics/physics experience An engineer is required to join a tea….
b+q sell an adapter to do this job as will most plumbers merchants
Buy Cheap Nikon Complete Lens Cleaner Kit Buy Low Price From Here Now Nikon Lens Cleaner Kit – Nikon 8176 Readmore Technical Details – Made By: NIKON SPORTS AND RECREATIONAL OPTICS – Model Number: 8176NIK – See Description See more technical details “Generics are as good” 2010-03-05 By A. Dent (Minas Anor, GD) The kit has what it takes to clean lenses on most devices that use them: cameras, eye glasses, binoculars and so on. You get the following: – 3 (THREE) moist lens cleaning toilettes – 1 fl. oz spray bottle of liquid lens cleaner – micro fiber cleaning cloth (black) As far as I can tell, all of the above are in no significant way better than their generic counterparts you can buy in bulk at any optics store, their only distinguishing characteristic being the Nikon name on the spray bottle and on the moist towelettes packs. By the way, the kit came inside an ordinary cardboard box – not the clear plastic one shown in the picture – and the microfiber cloth was folded inside the…
Hi. The type of optics do not matter as much as the tracking. I have a Meade Schmidt-Newtonion with a 6" mirror but excellent powered tracking. Exoplanets? Not in your budget (or at least not in mine!).