Hi I am using yongnuo 468 which is a TTL flash.
I set sync speed to 1/200 and realise that my shutter speed is 1/200. I am using AV mode and I set the aperture to F8, and the auto ISO show ISO of 400. I then set aperture to F5.6 and realise that the ISO is still 400 which is kind of strange.
I then tried setting aperture to F32 and ISO to 100 and tried shooting. It is strange that the metering in my camera still show 0. But when I shoot, the picture came out to be totally dark (as expected). Why didnt the camera warn me that my photo is underexposed? Thanks in advance