In a 5" refractor telescope, is there really a difference between tube construction steel vs aluminum? - refractor telescope construction
The thermal expansion coefficient of steel is half of what is made of aluminum. When a certain temperature, when the steel is 11, then aluminum-23.1. Is this really a problem in the design of the telescope tube? I understand that 5% of aluminum is lighter.
Saturday, December 12, 2009
Refractor Telescope Construction In A 5" Refractor Telescope, Is There Really A Difference Between Tube Construction Steel Vs Aluminum?
4 comments:
Thermal expansion is a concern only if you are a long exposure astrophotography, where the temperature changes will be necessary, casual to a new orientation. However, most premium refractors of aluminum tubes to use, because it is easier to work, easier to use and will not rust. Aluminum has the advantage of thermal conductivity - which is less likely than steel to different thermal expansion.
The temperature coefficient was not a major problem in the telescope, while the mechanism is needed to develop for the variation in the length of the telescope in the temperature range for use, can compensate, and if the telescope is the time to adjust to room temperature before they are used. You do not want your scope warmer or colder than the surrounding air anyway because of concerns associated with condensation and turbulence.
Of course it is there. The focus is two times faster. This means that you transmit twice as often. Wal-Mart for a telescope that is not properly taken into start, to bad. For an instrument that the quality is not. But is not used for such an instrument or equipment.
And make your telescope anyway. Want to reduce vibration.
It runs on one thing: There is no such thing as a telescope, comfortable, economical and powerful. You can see two of three, if you're lucky.
For visual observations, I doubt there is a difference, make the weight. I worked as a welder and I can say from firsthand experience that aluminum is about twice heavier than steel, but many strong and stiff enough for a telescope. It is the advantage of being more resistant to corrosion and no corrosion. For photography, moving the focus of the tube expands or contracts, you must set the camera focus to room temperature and to apply regardless of the what is the metal tube. In an alternative material that makes it very light, stiff and thermally stable telescope tube is carbon.
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