I had a Wollensak Raptar 1a triple convertible (13",20", 25") and found it to perform very well at 13 and 20". I did use a #12 yellow filter whenever I used the 20" conversion. 8x10" contact prints looked very good. The 25" negs were a bit soft the few times I tried that focal length, but I can't say whether it was the lens or the fact that my old Korona was pretty wobbly at full extension. I did not often use it in high-flare situations when converted, however. I liked the lens very much and found the 20" conversion to be my favorite focal length for many landscape situations. No balsam separation on my particular lens, which probably was from the late 40s-early 50s, but the front element did have a tiny bit of haze that did not seem to impede performance. I can't say anything about a Turner-Reich. The only examples I have encountered were pretty badly beaten, and I've never used one.