Thanks for the answers, but i think i fail to put a good question here. What i really need to know is how to prepare a good telescope. I mean what kind of mirrors i need and all other stuff i get from the local market and how to assembled it. Hope it clearify the air.
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If you have a "Star" club or a museum of "Science and History" you might ask them for help. One of the museums near me has a telescope class twice a year where on a Saturday they help you put together a very nice Dobsonian reflector. They give us the choice of a 4", 6" or special order 8" or really special order 10". By the end of the day everybody has a scope to take home. Of course it a prebuilt mirror and pre-cut wood parts etc. but it works great and the cost is less than you could buy just the parts for.
If you are looking to grind and polish a telescope mirror, it takes a lot of time, though it's not particularly difficult. However the cost of the mirror kit plus the cost of aluminizing is as much or more than a fairly-decent finished mirror these days. Ebay has the occasional mirror for sale; I bought a 4.5" dia. mirror in cell, plus a diagonal mirror, for $25. With those it's not hard to come up with the rest of the parts. And a few places will sell optical tube assemblies (OTA) at reasonable prices; you buy or build a mount. Good luck!
SIlvering is becoming popular again, because of the costs of aluminising. Me, I'm making a sold aluminium mirror at the moment - never have to pay to get it aluminised !
If you are willing to work from a kit (grinding a mirror from scratch requires substantial practice and experience), I highly recommend the Galileoscope, a simple refractor, which was distributed for last year's International Astronomical Year. If you put that into Google, you can find plenty of sources.
Making a small mirror is pretty easy. Time consuming sure, but hard to screw up if you're committed to making it.
Only 4, which ones? L
Do you want to make a mirror ?