Anybody know the difference between the ToU webcam and the Celestron NexImage Solar System imager? The Celestron unit is a bit cheaper. I want to use one to find guidestars and take planetary images. Also, can I use one on my 15" scope? I don't have a platform so I'd have to constantly nudge the scope to keep the planet centered. Debbie Somebody do a dance to stop the rain. I feel like I live in Oregon right now.