I'm nearly finished with an RFT refractor built around a (as sold and stated in their literature) Jaegers 110mm f/4.5 doublet. Using an original Jaegers lens cell, the clear aperture turns out to be nearly 107mm and the actual focal ratio is closer to f/4.4. It uses an Antares (same as GSO) single-speed 2" Crayford-style focuser. Aluminum tube and dewcap, Orion tube rings. All that remains to be done is to paint the tube exterior and line the inside with flocked paper. I may add a glare stop if needed, but based on my experience with flocking, it won't be. It should be completely finished in the next week or so. I'm using automotive paint (catalyzed) for all exterior finishes. Stainless-steel allen-head cap screw hardware & washers. I turned the focuser/tube adapter on my mini-lathe. The scope will be used in either alt-az mode on my "Weightless" mount, or on my CGEM on a short Losmandy-style dovetail plate. I'm adding an upper bridge plate of 1/4" thick aluminum on top of the rings for both traditional finderscope and a red-dot sight. It sports one of my molded-fiberglass dust covers. The dew cap is flocked and felt-lined and slips on and off. A Baader solar filter is also in the works, as is a foam-lined wooden case if I can't find an inexpensive military surplus case on-line. Daytime optical tests have been encouraging. Spurious color is surprisingly slight for such a fast cemented doublet, about the same as a well-made large binocular objective. It won't be noticeable at all on deep-sky objects. Jaegers certainly made some great achromats in their heyday. This scope is the "proof of concept" for my 5" f/5 and 6" f/5 Jaegers objectives, which I hope to build scopes around later this year. The 6" is air-spaced. Pictures: http://i260.photobucket.com/albums/ii24/JethroTull1958/ATM/refractor001_zpsb... http://i260.photobucket.com/albums/ii24/JethroTull1958/ATM/refractor002_zps4... http://i260.photobucket.com/albums/ii24/JethroTull1958/ATM/refractor003_zpse... You can actually just click on the first one and then scroll through the album, the second and third links are the next two album photos. Note the little 50mm f/20 refractor in the foreground of the first shot. This is the one I plan to re-observe the Messier catalog with this year. It is actually a 49.5mm clear aperture, f/20.5 achromatic doublet. I'll be using it on a small GEM with electric RA drive and manual DEC, from the back yard as well as dark sites. The "50mm Project" is a personal challenge project, to test my observing skills under compromised skies and with minimal aperture. I've observed the moon, Jupiter, and a few bright double stars with that little objective before with great results. The DS challenge will be interesting.