I mean, where can I get the real data?, I have to present a job about that , I'm using OSLO ( is anyone familiar with it?..it looks like chinesse to me :/ ) , but for the lay out I don't know where can I get the power , focal lenght of the lenses, the distances among them and stuff.
PLEASE help me with this one , Optics is not my favorite subject and I'm not sure if I can read an spot diagram and stuff :/. THANKS
2007-07-06 03:50:15 · 4 answers · asked by jueves 4 in Science & Mathematics ➔ Astronomy & Space
This site has some specifics on the optics Galileo used:
http://brunelleschi.imss.fi.it/museum/esim.asp?c=405001
Basically you need a positive lens, 30 to 50 mm diameter with a focal length of a meter or two for the objective, and a negative lens with a focal length of maybe -50 to -150mm for the eyepiece. The aberrations in a telescope like this are horrendous, so Galileo stopped his objectives down to around15mm.
An old 1-diopter camera close-up adapter lens makes a reasonable objective for demonstration purposes.
2007-07-06 05:56:04 · answer #1 · answered by injanier 7 · 0⤊ 0⤋
You can but a kit for $9 at the first source. It isn't really a Galilean telescope because it has a positive lens for the eyepiece and makes an inverted image (up side down). To make a true Galilean telescope you need a negative eyepiece lens. This will give you an erect image (right side up), and a much narrower field of view. The second source has such a lens, stock number AX20915 is about the right size for $8. If you really want you could order that separately and use it in place of the lens in the kit to get a true Galilean telescope.
2007-07-06 04:55:11 · answer #2 · answered by campbelp2002 7 · 0⤊ 0⤋
You need one objective lens, which will be a CONVEX lens of LONG focal length.
You will need one eyepiece lens, which will be a CONCAVE lens of SHORT focal length. (I would go with Anchor Optics AX94835, which is both cheaper and shorter than AX20915)
The greater the difference in the focal lengths, the greater the magnification. Most such telescopes today have about 3 power, that's a good number to shoot for.
Mount the objective lens in front and the eyepiece behind. It helps to have a tube to block out stray light, but is not absolutely necessary in daylight conditions. Adjust the distance between the lenses until the image is in focus and upright.
Good luck!
2007-07-06 05:00:13 · answer #3 · answered by Keith P 7 · 0⤊ 0⤋
I don't know.Loser,hahahahahahaha.
2007-07-06 04:21:41 · answer #4 · answered by Anonymous · 0⤊ 2⤋