Okay, full disclosure first: I've never really tried to fully grasp the settings on my X100. I've used some of the setup information listed on this forum, but I've never tried to understand the "whys"; maybe now I'll start that process. Anyway, this morning I set out to take a few test photos of the local wetland and waterway; terminology here is a "bayou". Bright but hazy sunshine, broken clouds, around 9 am Central Time in Houston. Not great conditions, but I had a deadline. I had the camera set to Auto ISO, Aperture priority, and selected aperture f/5.6. So I frame and half-press the shutter - and the camera chooses ISO 800 and shutter speed 1/2500 second! Why would it do that? What settings have I chosen that would force both ISO and shutter speed upscale, where there was plenty to work with at normal ISO? I tried a few times and kept getting these unusual settings, then gave up on Auto ISO and switched that off. Thereafter, no problem with operation. I'm sure it's some misunderstanding of settings on my part. Anyone have an idea what I need to change? Thanks in advance.