This is quick and easy. No fiddling around and it works the majority of the time. If you try it you may not bother with the other methods. But if you're trying to work in a set piece situation you WILL need to work a more accurate method.
Originally Posted by polyglot
I believe the Pentax 67 has a sync speed of 1/30 of a second so any comment regarding ignoring shutter speed should be taken with a grain(or two) of salt. Using a higher shutter speed will fire the flash before the shutter opens.
Unless you're using one of their leaf shutter lenses.