Starquake, some figures for you. The long telescopes that I know of use a single lensed eyepiece of five inches focal length. so the 210 foot scope would have: 210X12= 2520 inches f/l, divided by the focal length of the eyepiece at 5 ins would yeald a power of X504. I forgot to qualify the diameter of the pinhole for thr long scope, it is of course 3 inches IE remove the three in lens and would you still get the same results from the slighly less than three inch hole in the support plate.