Consider grinding/polishing your own mirrors for a Dobson (Newtonian) by referring to "Sidewalk Astronomy" website http://www.sidewalkastronomers.us/id5.html where U can find instructions to build ur own> I did & found the most difficult part is FINE GRINDING where the solution is to use GRAVITY as a force> This is NOT in instructions> I learned it from a Danish Optics Tech who polished mirrors for NSO Nat'l Solar Obs. nearby> For a 10" mirror take a 7.5lb bar bell weight, & pace it upon the grinding slab (an 8" blank) but w./a slab of foam cushion 4" thick between the weight & blank for even distribution of the gravity load> Push that around on the 10" mirror and U get a perfect sphere> Your cost will be ~$300 totalWhich is the best affordable telescope I can buy in India?