Schmidt Cassegrain mounting secondary lens in cassegrain??
how can i mount a secondary hyperbolic lens to my correcting lens in a schmidt-cass i'm working on?i plan on drilling a hole in the corrector to eliminate spyder defraction. any ideas??
I think it would be better to clarify the question a bit. If it is an SCT then it has a corrector which holds the secondary. Therefore, there is no spider diffraction because the secondary is held up by glass. Since there is a hole in the corrector to hold the secondary already, it isn't clear why you are drilling one. So it's hard to figure out what you're doing.
Modifying an SCT is a very technical question for Yahoo! answers and it seems to me that you would have better luck on one of the Astromart forums. Or, read the wiki article below and check out the links that it provides at the bottom.
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Difference between refractor and reflector telescope?
What is the difference between an refractor and reflector telescope. I own and Celestron Nexstar 4se is that a refractor or reflector?
refractor is that object through which light can pass through it
on the other hand light cannot pass through the reflector instead it reflects back
Refractor
A refractor telescope uses convex (bending outwards) lenses to collect, focus and magnify light. Rays of light travel through the objective (main) lens where they are focused at the focal length of the eyepiece.
Reflector
A reflector telescope, on the other hand, uses concave (bending inwards - like a cave) mirrors. As the diagram illustrates light travels down the tube where it is reflected (hence the name reflector) up to a secondary mirror near the top of the tube which directs the light into the eyepiece. This exact system is known as a Newtonian Reflector. There are quite a few variations on this including the Georgian and Cassegrain reflectors.
A Refractor uses a lens. A reflector uses a mirror.
Refractor-light passes through a lens and into the eye.
Reflector- light is set on a mirror and is viewed on a mirror.
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Telescope Stars The pair of stars in Albireo is 34 arc seconds apart. What size telescope can resolve them?
The pair of stars in Albireo is 34 arc seconds apart. What size telescope can resolve them? I am thinking it is 34 cm
The smallest resolvable angle, in arc-seconds, in visible light is given by the formula:
116/D
where D is the aperture (diameter) in mm
116/x = 34"
x = 0.24 mm
A 34 cm telescope should be able to resolve angles of
116/340 = 0.34" but Earth's atmosphere limits us to 0.5" on good days.
---
I've looked at Albireo in a 80-mm telescope and it was well separated.
In theory, we should be able to split it with the naked eye (7 mm) but the stars may be a little too faint to be interpreted as two separate dots (the brain has a habit of 'correcting' what the eyes pick up).
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home telescopes How to Build a telescope and periscope at home. How to build a remote controlled aeroplane that fliesat home?
With least economy.
With least economy? You want to spend millions? Or Billions?
Perhaps you mean with most economy....that is, with the least money spent.
Building telescopes is a hobby for thousands of people world wide. I made my first at 12 from old lenses. At 13 I ground and polished my first telescope mirror. My best home-made telescope would cost around £1200 to buy new. It cost me around £150 to make, doesn't look as grand and suave as the bought version but performs beautifully.
Look up ATM, which stands for Amateur Telescope Making.
There are thousands of web pages about it.
Putting a telescope or astronomy reference in the search avoids getting other ATM's, like bank machines etc. and putting ATM in gets rid of telescope sales outlets,etc.
Sample search here . . http://www.google.com/search?q=atm+telescopes&rls=com.microsoft:en-gb:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7GPEA . . . . .
Periscopes are easy to make with two mirrors and a tube or make a long box to hold them.
http://www.science-experiments.info/Build_a_Periscope.html . . .
My wonderful friend Horace Dall from my early telescope-making days built one that looked from the top of his house and included a lens....it was a camera obscura actually, but with an adjustable mirror at the top.
There are loads of home-built aircraft flying.
Tens of thousands of radio-controlled home built model planes, and hundreds of home built full sized planes for a pilot and one or more passengers, but not as far as I know, for remote control.
There are however some very big models, with chain saw engines running the propellers and wings ten feet across. You can see them sometimes displaying at air shows.
There are air regulations to cover everything that flies, and getting a certificate or permit for a remote controlled full sized aircraft would be very difficult.
Pilot-less remote controlled aircraft intended for more than just being a model are called drones, and are used by the military for photo reconnaisance and survey work and for dropping bombs without risking human pilots, for scientific experiments and meteorological measurements, for a few advertising purposes trailing a banner, and increasingly for many other purposes, and for a lot less cost as well than by using a full-size piloted aircraft.
A drone can be very light compared to a full-scale fighter aircraft, runs very economically, much more stealthily, and is very much cheaper to build.
Drone search here . . . http://www.google.com/search?q=drone+aircraft&rls=com.microsoft:en-gb:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7GPEA . . .
Sample search here for model planes with radio control
http://www.google.com/search?q=radio+controlled+model+plane+home+build&rls=com.microsoft:en-gb:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7GPEA . . .
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How to Use Telescopes : Internet Resources for Telescope Viewing
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