Ambiguities in fits of observed binary lens galactic microlensing events

For observed galactic microlensing events only one fit is usually presented , though, especially for a binary lens, several fits may be possible. This has been shown for the MACHO LMC#1 event (Dominik & Hirshfeld 1996). Here I discuss the strong binary lens events OGLE#7 and DUO#2. It is shown that s everal models with a large variety of parameters are in accordance with the photometric data. For most of the fits, 1-sigma-bounds on the fit paramete rs are given. The variation of the parameters within these bounds is in som e cases considerable. It is likely that other binary lens events which will occur will have properties similar to the discussed events.