Thanks for all the Portaball comments. Yes, it has Zambuto optics, is the 12 1/2" F/5 model. I have bags of lead shot to put in the ball near the mirror if I need more weight there. It moves smoothly. It has the Rigel finder scope with dew heater for it and the secondary, a standard option. I also added on an Orion light weight right angle erect image finder which I recommend even with the slight extra weight in the ball. This is over 5 years old, an improved version is sold now.