Roger Ceragioli wrote: > one Schott blank equals ~250 pieces of 6" pyrex!< I'm sorry but as nice as a 8" apo refractor might be, the price is too high. I'd rather make a 20+" newt. -- Searching for Parabola, JoAnn. Portland, Me. Adventures of ATM Woman! http://members.tripod.com/nanof/atmwoman.htm