Nevertheless, I refuse to say, that it's senseless to proceed in this direction. There's so much to learn and to gain. But be prepared, it's a very hard bread to bite...

Neither did I "say that it's senseless". I just wanted him to get into this with open eyes. As you stated "Heart operation with closed eyes" can be very dangerous and Prahlad, as far as I recall, has done many useful things, getting into making a scope can be utterly frustrating if you are not aware up front that this is not "a piece of cake" but "Very hard bread to bite". This is not the first time someone has told me "I am going to build a scope" but if Prahlad is successful, that will be a first. I have been exposed to some of the offerings of "PC scopes" and "economy scopes" and I have yet to find one of these, supposedly commercial, products faithful to work even within their specified limitations.

Erik