I've had the x100F for awhile and while I mostly do landscapes and street, I'm looking in utilizing the leaf shutter and built in flash to improve environmental portraiture. I don't really like the grainy look of people's faces, especially when you bring up thr shadows in PP when a shot is taken against strong backlighting/face is dark. I've heard that flash can remedy that while also 'crushing' the ambient lighting so that the background isn't blown out and is more balanced against the subject. I did a quick google search for some pointers and thus far have had limited success. I read to try, in broad daylight, iso 200-400, set the aperture at somewhere in the middle f5.6-8?, and adjust SS manually because that controls how much ambient light is let in? I think the ND filter helps so you can increase your shutter speed 3 stops higher? I've also read TTL mode is more of an auto mode compared to manual so I've been starting with that. And people seem to like -2/3 on TTL. There is no specification about shooting distance and how the focal length of the lens matters when adjusting TTL strength though. I think my problem may be there. Any pointers would be helpful. I'm not looking to invest in a speedlight system or anything yet as I want to get a hang of the built in flash more. If you have samples of shots with and without flash, that would be greatly appreciated as well.