Posted 02 November 2005 - 10:17 PM
Posted 02 November 2005 - 11:11 PM
Keith in Portland
Posted 03 November 2005 - 08:53 AM
Showing my complete ignorance, I have no idea how to trace rays! As we may not see the sky for weeks (months?)I may just turn a tube adapter on the lathe and replace the whole tail end with a 2.5" tube and add a new focuser, updating everything at once..
Posted 03 November 2005 - 12:56 PM
In order to ray trace, there are probably some really good posts here, but for a basic overview you precisely draw the exterior and interior of your telescope on paper, including baffles (generally 1:1 scale) and 'trace' the light path from front objective to eyepiece. It the light path cuts through space occupied by baffles, drawtube, etc then you have some light loss.
BTW: I'll still buy the scope if you want to save wear and tear on your shop Smithy.