Surplus Shed is currently offering a limited number of "new", old-stock objectives from A. Jaegers, up to 6" aperture. The clever ATM could build a really nice refractor for a small fraction of an equivalent commercial refractor. 3 pages of Jaegers listings, starting here: http://www.surplusshed.com/pages/category/jaegersobjectives_1.html They also have cells for some of them. I grabbed a few while the grabbing was good. Jaegers objectives are remarkably good for their price, even back in the old days. I would rate them a notch higher than the Chinese lenses currently flooding the market. Fred at Surplus Shed is testing the large ones, and making registration marks on the edges for rotational alignment of the elements. Most are not coated, but that is of minimal concern. You may even be able to find a local lab to coat them for you, for a fee, if you can't live without a coating. There is also an old-fashioned method that allows kitchen chemists to coat their own lenses. A vacuum chamber is not required. I grabbed the 6" f/5, f/10, & f/15, as well as several smaller sizes. The cells require 7" aluminum tubing. Harward Irrigation in Utah county sells it. I made the 3" finder on the Ealing at SPOC, using a Jaegers objective donated by Siegfried.