Hi I have used the Metz 50 MZ5 with a Nikon F70 and SCA adaptor 3401 without any problem. However, when I use my Nikon F100 I find that when using matrix fill in flash [switch 5 to on] the flash is mis-firing [series of flashes without pressing anything] and not firing every time when taking a photograph. Everything else works perfectly. Anyone else had this problem? Is there a fix ... I already tried most things? Regards Keith