In my experience, it only applies to the J-12 and CZJ Biogons, the rear element is just too big. All my other LTMs, even the Canon 19mm in LTM, worked fine. The ability to use just about any LTM lens is what initially attracted me to the Sony cameras. I have used all sorts of LTM Canons, Nikkors, CZJs and Jupiters on the Sony APS-C cameras without issue.