After having been confirmed in another thread (Tessar lens) that the lens on my Welta Weltax is good stuff, I turned my attention to the shutter. It's my impression that many of these old folders often combined good glass with less excellent shutters or the reverse. Mine has a TEMPOR shutter that is recently cla-ed. Speeds and self timer are running fine, except the fastest shutter speed promising 1/250. I took interest in finding how much of the open time the shutter blades spend travelling from closed to fully open and back again from fully open to closed. So I tested the speed at 1/250 and f:16 which gave 1/106, and also at 1/250 and f:3.5 which gave 1/180. To measure the open time at max aperture, I only let light through to the periphery of the lens by covering with a cardboard. See photo. Ironically a little math shows that the time the shutter blades spend on opening/closing is close to 1/250!