what I am doing currently is just using custom auto ISO. set the highest shutter as much as possible, in Ixus 115, it is 1/1500
with this I sometimes get an picture taken at ISO 1600. the flash is giving good enough reach, as it is ISO 1600. However, this is not optimal in most case. when I check the photo in computer screen, it seems the ISO is unnecessarily high. Use a lower ISO could give less noise and better color.
as in my first post. the 1/1500 ISO 1600 combination might give the same exposure as 1/100 ISO 100. the different is the flash reach. At 1/100 ISO 100, the flash might not be powerful enough to light a person 4m away. ISO400 1/400 will increase the flash reach, but keep the noise at acceptable level.
I don't need ISO1600 if the person is 4m away, but if the person is 8m away, ISO 1600 will be needed.
let me try to describe the steps need to be done to make the proper setting:1. preflash and do flash metering
2. adjust ISO to make a full power flash give proper exposure to the object (since aperture is fixed and flash can sync at all shutter)
3. adjust shutter to cater for the ambient exposure
4. take the picture and flash fires
I have been playing with flash and the 1/1500 flash sync really helps a lots.
How does that compare with simply reducing the flash intensity and using a 'normal' shutter speed ?
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