Enjoy your DS-10 rebuild, Robert. Should be a fun project. Based on what I've read, the 10" mirrors' figure were better and more consistent than the 16".
I have a DS-16, appears to have all options, and also has the Parallax rings. Some details about it are in this thread:
Most of my wrestling match getting it into workable shape was posted on another forum (in which I no longer participate), I hope its not against TOS to post a link:
The primary was horrible, 1/2 wave at best, and was refigured by Mike Spooner and is now very good.
Frankly I have a love/hate relationship with it. The mount is pretty good, and it tracks well. Rotating the OTA is a chore, like hugging a large water heater. The focuser stinks. Even with fans installed, cooling is sub-optimal. Like Loren's scope, mine doesn't hold collimation when the OTA orientation is changed significantly. Its in the primary cell. For all the bad press the single-vane secondary gets, mine is remarkably stable. I could go on.
But... if I plan my observing and work one part of the sky, I absolutely love the thing. There's nothing in my experience like having 16 inches of tracking aperture. Those moments are what stops me from converting it to a dob, which in most respects would make a lot more sense for me. Maybe it will happen this year.
It lives on my viewing pad, which my other scopes understandably resent. I built a removable-top box for it, it was supposed to be temporary, but it's held up now for almost two years without leaks, and so it stays...
Edited by precaud, 18 April 2015 - 06:44 PM.