Hi I'm new to the forum and also fairly new to my Sony A100 which I've just started to use manually. So far I have been experiencing some difficulties when trying to set shutter speeds and apertures. For example I try to set a shutter speed of say 150 sec and then try to adjust the aperture to zero on the EV scale and am unable to do so. I also find that the shutter speed changes when I adjust the aperture value. I always thought that the shutter speed and the aperture could be adjusted independently of each other regardless of the settings chosen? I have also experienced difficulties in altering both the shutter speed and apertures which appear to become frozen. I find myself turning the control dial and not being able to select the shutter speed I require without also adjusting the aperture I would appreciate any advice from other A100 users, as to how they set up the camera prior to shooting in manual mode. Either I really am a dufus and need to spend more time learning the cameras settings or there may be something wrong with the camera?