First, thank you so much for your tips. It is really appreciated for me.
I am so new with the flash. I read through your whole discussion and try to learn as much as I can.
I just have a few questions for you and hope that you can help me out.
1- When i use the stofen diffuser, do I keep the flash angle to 45 as per stofen instruction? or Stright up to celling (90 degress) or direct to subject?
2- for 450D (or XSI), ISO 1600 is really noisy, can i use ISO 800 but keep the shutter speed to 1/40 as you suggest? Will it make the flash to flash more agressive so that my subject will be overexposed?
3- My kit lens can open to F4 apeature as max. Can I still using the 1/40 shutter speed, ISO 1600? because you are using F2.8, Will it make the flash to flash more agressive so that my subject will be overexposed?
4- If I want to shot a group of people (like say 4 to 5), Can I increase the Apeature to F8? otherwise some people in the group will be out focus. Again, same like question 3, can i still using shutter speed of 1/40, ISO 1600? As I increase the apeature, will the flash once again flash more agressive so that my subject will be overexposed?
5- If the flash is too powerful due to I lower the ISO or Decrese the apeture to F8, can I adjust the Flash compensation to make it less powerful? What is good starting point? Is -1 a good start? If I adjust the flash compensation, will it make any impact?
Sorry for long question but I really want to master it as I will soon need to apply this technique for my frend wedding.
Thanks in advance.