I have seen two numbers, 31% and 35% for the secondary obstruction on this telescope. Sometimes the primary baffle on cassegrains can push deeper into the light cone and increase the obstruction over that which would be normally the result of just the secondary housing diameter. That is why the best way is to measure the cental obstruction at the exit pupil of a low power eyepiece, using a magnifying reticle. Anyone done this?
"--Granted, that's a worse case scenario. The destruction might in fact be ... limited to our own galaxy."
