With lockdown I got to think of things and try things out to educate myself. I haven't used flash often but I have read stuff about it and then I left my flash for months before even taking it out. I've started playing with my softbox and then I tried bounce flash today. Question: sometimes we are told to underexpose the ambient light by a bit and then fire the flash. I've been able to do this in M exposure mode and then manual flash output. When I want a bit of automation, I set my camera to A (aperture priority) with a -1 EV exposure compensation and then I turn my flash on either manual flash output or TTL flash, my camera's shutter speed changes. Why is this and when people want to underexpose the ambient light by a bit and then fire the flash what do they do? Cheers. Edit. Part of the issue might had been my flash shutter speed in the settings. I dropped that right back. I have a 1/30 speed in aperture priority mode it stays at 1/30 with manual flash power output. Once I switch my speedlight to TTL flash my shutter speed changes to 1/60. Why is this?