Amateur Astronomy For Beginners: Eyepieces
Tuesday, December 15th, 2009 at
9:11 pm
Amateur Astronomy for Beginners: Eyepieces
Amateur Astronomy for Beginners: Eyepieces
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I used to have a 5 inch reflector from Celestron, with a go-to mount. I could never align it against the three bright objects in the sky. So, I gave the telescope away. I am thinking of getting a 60mm aperture TeleVue apochromatic refractor, with 360mm focal length, and a 24 mm eye piece for starters. For the second eye piece, how far do you think I can “push” such a little refractor scope? 60x max? 120x? 80x? What’s your advice?
I personally would go with 5 inch telescope myself. If you can find a dobsonian I would give one a try. Other than the finderscope you dont have to align a dobsonian. After having used much larger scopes for many years I can tell you that a 60mm refractor is disappointing. It might as well be a binocular.
Well, that’s what I thought. The little 60mm aperture Televue refractor would give acceptable 4mm exit pupil with the 24mm eyepiece giving 15x magnification. So, my 16×70 binocular can do better than that. If I used the 6mm eye piece for 60x magnification, the exit pupil diameter would only be 1mm, which is way to dark… I’ll stick with the binocuars then for now. My issue is portability, because I don’t have a car, so I can only walk with my scope. In that case, the binoculars are good.
So you’re saying that we wouldn’t see colour through the telescope, but we would see it in the photos?
Yes, for most objects through the telescope, we use mainly the rods in our retina which only see in black and white. The cones, the color receptors in the retina, are just not as sensitive as the rods and thus less sensitive to dim objects.
Thank you for this video, truemartian. I just got my first telescope, and thought it was a piece of junk before I saw this. Apperently I had too much zoom, I don’t even know, all I know is that you helped alot!
- Berkley
Hi truemarian, is there any difference between having the 15mm eyepiece with a barlow lens attached to it or a smaller eyepiece of the same magnification?
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.
test 1 2 3
*it´s refractor
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What is the benefit of an oil-immersion objective? Can we go over the different eyepieces as used in microscopes and telescopes? #Claire
Amateur Astronomy for Beginners: Eyepieces
One doesn't go into astronomy to get rich. You'd better try banker in that case.
But astronomy is interesting. Go outside on a starry night and look with binoculars at Jupiter, the Moon or the Pleiades. You either get hooked or… well, there must be other interesting jobs too. If you like stuffy offices…
Subject: Eyepieces and Mak for sale – by: joner: Hi.
Is the 11mm Nagler a type 6 design ?.
I might be intrested… http://bit.ly/6vyBuQ
I love the blinkenlights excuse – of course if they were flashing blue laser LED’s it would work better…
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A different astronomy and space sciencerelated image is featured each day, along with a brief explanation.
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]
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Thank you…
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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
ok its official BANG YA whistle! im GOIN iN on this ASTRONOMY !
Jason & Cameron are discussing HD vs film and monitors vs eyepieces. QT is shaking his head
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(online ones)
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MIT might be your best bet plan on four years plus for undergrad.
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Thanks for the review! Please keep it up.
Because the "list price" is almost always higher than the actual selling price even if there isn't a "sale". It is a frequent marketing ploy to accentuate the "value".
That said, the Zhumell are considered good performers and are essentially the same as the Orion "Edge-On" Planetary Eyepieces. Personally, in medium focal lengths I would suggest Orthoscopic eyepieces at about the same price (or less if you buy used), but you shouldn't go too wrong with the Zhumells.
If you find a community theatre group or something at a church you can probably get a part for your first show and help with direction. Give suggestions and things like that. Show them you are interested and know a little about the process. Then maybe you can direct the next show. They always need directors.
I agree- this has amazing atmosphere. You can just about jump up and walk around in this song.
test 1 2 3
wow, so this was actually taken with that camera?!?!?! can you zoom while recording?
Celestron Lens Pen – Clean Telescope & Eyepieces – New
The measurement of an eyepiece is usually the focal length measurement. The smaller the number the bigger magnification. Should be eyepiece (flat round part of actual lens) and a tail piece, (round cylinder that fits into the scope). The tailpiece is usually a standard size in diameter.
Nice Lenses.
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Stick with the 25mm and get a Barlow lens and a lunar filter with a double polarizing filter on it. Otherwise don't buy any more. Most likely the 10mm is useless to you as it is. Urban areas just don't have the skies to support such an eyepiece. So don't even go for the 6mm. you'll barely use it.
If you've got a 2" focuser, the a two" 35mm might be a very nice addition to your ensemble.
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Just your basic core classes, but try to do honors science and math (particularly physics) and succeed in them. If your high school has an astronomy class, then take that, but I doubt it.
…cont) beginners
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S. Ganesh, U. C. Joshi, K. S. Baliyan, S. N. Mathur, P. S. Patwal, R. R. Shah this URL Physical Research Laboratory’s (PRL) Optical Polarimeter has been used on various telescopes in India since its development in-house in the mid 1980s. To make the instrument more efficient and effective we have designed the acquisition and control system and written the software to run on the GNU/Linux Operating System. CCD cameras have been used, in place of eyepieces, which allow to observe fainter sources with smaller apertures. The use of smaller apertures provides dramatic gains in the signal-to-noise ratio. The polarimeter is now fully automated resulting in increased efficiency. With the advantage of networking being built-in at the operating system level in GNU/Linux, this instrument can now be controlled from anywhere on the PRL local area network which means that the observer can be stationed in Ahmedabad / Thaltej as well or via ssh anywhere on the…
See you in Hell, Rudy Jewlianni
There are many places you can get inspiration for scrapbooking. there are plenty of magazines in your local newsagents, or try Borders bookshops if you have one locally as they have a bigger choice. I wouldn't suggest buying a book, they will be quite expensive.
another place to try would be http://www.docrafts.co.uk they have alot of galleries of what people have done, there is also places on there to see what kind of things are available and where to buy online.
I would also suggest having a look at the QVC website, they sell many scrapbooking project packs and you will also be able to watch videos online on how the products go together.
you may find it difficult to scrapbook with the A3 book you have, I am guessing this is one of the books that you used to buy with sugar paper in? the scrapbooks that are used now are 12" x 12" paper, they have a substantial covering on them, and page protectors inside. if you take a look at the above places I have suggested you will see. much better for what you require and you will be able to pick up a baby themed kit.