How To Use Telescopes : Telescope Eyepieces
Wednesday, November 18th, 2009 at
8:48 pm
Telescopes can feature different eyepieces that change magnification and viewing options during telescope use. Learn different eyepieces for telescope viewing from an observatory director in this f...
US $1.00
Dude..that looks like Arkansas….thanks for the info.
thanks for the stuff about the barlow lens, but what about the thing that is called the erecting eyepice????
is ‘edu-science’ brand of telescope a gd starter telescope? thks
Thank you for showing me how to use a Barlow lens. I have been given a telescope with no instructions and wasn’t sure how it fitted together – I do now thanks.JIm
I know you did not mention variable barlow lens but are the 2-3 variable any good and would you recomend them or are they low quality.
I have bought this piece and the viewfinder shows objects a bit larger than what i see them with my own eyes. Good adittion, the rubber tough is not perfect, but if i pull the rubber forward then i get a full view with almost no vignetting and i can see the status indicators too at the same time, its definetely a good adition to the dslr
cool I want this on my Tiger tank
About to help 500 8th graders each build their own telescope in 2 hours. Please send me strength.
Without god, we would have hover cars, because of the christian dark ages, when people like YOU surpressed the ways of science…..Bastards
Boy– good question — I assume your club has experienced members. If they do:
10 inch or 12 inch DOB — go ahead and get the object location computer– so less experience members can quickly find objects.
if you still have money then a refractor such as a Stellarvue 80/9d which you can find used on AstroMart, on a polar mount.
and if you still have money something like an LX200 8" or 10" or a similar Celestron SCT again buy used on all of these scopes-
Added up you should be able to find all of these for about $3000 US dollars used in very good shape.
Start with the DOB as your first purchase– say about $900 or less used…. check out a 10" Orion Intelliscope— or a Zhumell
Wow, did NIN rip this guy off or what? ^_^
Diagonals are usually not used with newtonian reflectors, a 3.5mm eyepiece will give alot of mag with your scope usually lower powers are best with your model, wider fields of view. With a barlow lens the mag may be too much except for really exceptional nights when the air is really still.
Thanks!!!NICE VIDEO!
They allow a wider field of view in long focal lengths (20mm and longer). There's no big advantage at shorter focal lengths as they tend to be heavier and more expensive. Oh, actually there is one advantage: you don't have to fiddle around with 1.25" to 2" adapters
The eyepieces you are talking about have optics for a 1.25 eyepiece with a shoulder that fits a 2.00 holder.
Do some google searching for good eyepieces (televue, for example). You can find detailed, dimensioned drawings and pictures that show what I'm talking about.
NASA’s Hubble Space Telescope has reached back 13.2 billion years — farther than ever before in time and space — to reveal a “primordial population” of galaxies never seen before.
Here's a site that offers online time rental of telescopes around the world. How cool is that!!
U have good information.
Subject: New scope with crap eyepieces? – by: Mike: Hi Crescent, Firstly congratulations on an excellent first … #fb
WOW
In this case, you have a telescope with two eyepieces and thus the figure of merit is the angular magnification of each. Using ray tracing we get
Angular Magnification = f_primary / f_eyepiece
For eyepiece 1 we have
Angular Magnification = 800 / 18 = 44
For eyepiece 2 we have
Angular Magnification = 800 / 30 = 26
Yeah I may scrap the plan for that "Telescope Love Affair" song after all haha.
BuyDig.com has the Celestron Powerseeker 114 EQ Telescope for $90 with free shipping. Features a 3x Barlow lens, 5×24 Finderscope, two 1.25″ eyepieces, pre-assembled aluminum tripod and accessory tray, slow-motion controls, 114mm German Equatorial reflector. [Compare]
whtats the wtf about??? the size of that reflector??? phee….i’ve got 16:…thats a 10″..
Currently Esa's venus express is orbiting venus, see
NASA's Pioneer Venus mission (1978), the Soviet Union's Venera 15 and 16 missions (1983-1984), and NASA's Magellan radar mapping mission (1990-1994) provided together a comprehensive picture of a dry world, with landscapes shaped by volcanic and intense geological activity. There were vast plains marked by lava flows, bordered by highlands and mountains.
But the history of Venus exploration goes back even further…
Mission (year) TypeHighlights
Mariner 2
USA, 1962Atmospheric probeFirst spacecraft at Venus. Closest distance 35 000 km. No magnetic field detected.
Venera 4
USSR, 1967Atmospheric probeFirst probe to return data about atmospheric composition.Crushed by pressure before reaching the surface.
Venera 5 & 6
USSR, 1969Atmospheric probesDetected presence of atmospheric nitrogen and oxygen.Crushed by pressure before reaching the surface.
Venera 7
USSR, 1970LanderFirst successful soft landing of a spacecraft on another planet.Measured surface temperature and pressure.
Venera 8
USSR, 1972LanderFirst to measure windspeed as it descended through atmosphere.Surface composition measured by gamma-ray spectrometer.
Mariner 10
USA, 1974Fly-byFirst spacecraft to have an imaging system, flew by on way to Mercury in 1974.Recorded atmospheric circulation and cloud-top temperatures.
Venera 9 & 10
USSR, 19752 orbiter/landersFirst spacecraft in orbit around Venus.Landers returned the first black and white panoramic images of surface.
Pioneer Venus 1 & 2
USA, 1978-19921 orbiter
4 atmospheric probesLongest mission in orbit around Venus (14 years). First orbiter to make radar map of surface.Measured structure, composition and cloud properties down to 12 km altitude.
Venera 11 & 12
USSR, 1978Fly-by, 2 landersLanders investigated structure and composition of atmosphere and clouds, measured solar radiation.Atmospheric dynamics were studied by Doppler tracking.
Venera 13 & 14
USSR, 1982Fly-by, 2 landersLanders returned the first colour panoramic views of the surface.Conducted soil analysis, found leucite basalt (rare on Earth) and tholeiitic basalt .
Venera 15 & 16
USSR, 19832 orbitersRadar mapping of the surface.Detailed study of mesosphere and cloud tops by high-resolution thermal emission spectroscopy.
Vega 1 & 2
USSR, 1985Fly-bys, 1 lander and 1 balloon eachEn route to Comet Halley, dropped first balloons into atmosphere of another planet, to record winds.Landers provided precise temperature profiles down to surface.
Magellan
USA, 1990-1994OrbiterFirst almost-global radar mapping of the surface.
Galileo
USA, 1990Fly-by en route to JupiterSpectral imaging of night-side near-infrared emissions.Detection of radio waves possibly emitted by lightning.
Cassini-Huygens
USA/ESA/I, 1998/99Fly-by en route to SaturnSpectral imaging of night-side near-infrared emissions.
Definitely. Makes me think of in I Heart Huckabees, when he goes “but we’re not in the universe, we’re in the suburbs” and then Dustin Hoffman says “This IS the universe!”
This nigga walkin round with telescopes on his face. How the fuck u make the "smart look" look dumb?
Information has gone from scarce to superabundant. That brings huge new benefits, says Kenneth Cukier (interviewed here)—but also big headaches WHEN the Sloan Digital Sky Survey started work in 2000, its telescope in New Mexico collected more data in its first few weeks than had been amassed in the entire history of astronomy. Now, a decade later, its archive contains a whopping 140 terabytes of information. A successor, the Large Synoptic Survey Telescope, due to come on stream in Chile in 2016, will acquire that quantity of data every five days. Such astronomical amounts of information can be found closer to Earth too. Wal-Mart, a retail giant, handles more than 1m customer transactions every hour, feeding databases estimated at more than 2.5 petabytes—the equivalent of 167 times the books in America’s Library of Congress (see article for an explanation of how data are quantified). Facebook, a social-networking website, is home to 40 billion photos. And decoding the human genome…
You can get a 4 1/2" reflector from Walmart with a clock drive that would work fine for $300.
So who ya gonna put your stock into; The guys that brought us Hubble…?..or the guy’s that brought us The “700 Club”?
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.
I’m not sure, but someone once wrote in and said that the field of view may be different. Otherwise the magnification is the same.
Compact and high-performance, the Sportstar EX 8×25 binoculars come with push-down rubber eyepieces that are great for long sessions of observation! What’s more they also have fitted precision lenses and glass prisms. Their multi-layer processing of lenses allows for a maximum transfer of light in all circumstances.
Knowing the size of your objective would be a help, but as long as you don't go over 40-50x per inch of aperture, you'll be OK. I'm guessing you might have a 120mm f5 made by Synta and sold under the Orion or Skywatcher name.
The "inexpensive" eyepiece line I use and suggest for planets is the Burgess/TMB Planetary series. They're available in 2.5, 3.2, 4,5,6,7,8, and 9mm focal lengths. New, they're $99 each, but they seem to go on sale every few months.
They have large eye lenses and 16mm of eye relief so they're comfortable to use, and they're great for public outreach because even beginners can find the image in the eyepiece.
They have a 60 degree afov.
I have all but the 6mm one. I also use them for smaller Deep Sky Objects. If you see a six for sale, it might be the "garage sale" one that was introduced first. It had the wrong coatings and the wrong eye lens, and they were all sold at half price.
I'd start out with the 5mm one. That'll give you 120 power. At that magnification if seeing conditions are reasonably good you'll see some detail on Jupiter and Saturn.
The 4mm would give you 150x, and the 3.2mm would give you 187.5x But as magnifcation goes up so does your need for better seeing conditions. Go a little conservative so you end up with an eyepiece you can use often.
Hi,
I just want to advise you never to get a Bushnell Northstar telescope, or any telescope Bushnell makes, for that matter. They may seem like a bargain (built-in computer and everything), but they are so difficult to set up and none of your settings are saved. I have yet to look at anything through my telescope.
#iowstarparty woohoo – won a set of eyepieces in a bum-bag from the WideScreen Centre – thanks guys!
I don’t see why not, but it seems to me that it would make it difficult to look into.
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Saturn and the moon were stunning last night through my scope! Need more eyepieces!!
RT Hunting the Edge of Space, on PBS TV 4/6 & 4/13. How telescopes have expanded our view of the universe.