I get my thread hijacked with technological arguments
Heh, heh, count your blessings. Some of the hijackings related to DOF result in far worse than mere technological arguments and you may learn that some folks would take offense at the notion of "YOUR thread". Any thread is fair game to dump any kind of sh*t into that happens to be on somebody's mind, whether it's relevant, interesting, useful, welcome, tactful, or intellegent or not. Fortunately, many threads are nevertheless very productive here. 'Nuff said.
Well, almost 'nuff. The one bit of advice I dare offer in spite of my burn scars is that you can pretty safely heed anything that Jonathan tells you. He actually takes pictures that he actually lets us see and he actually makes his living with photography and he actually knows what he's talking about and his advice will actually have some practical relevance. Honest. I even suspect that Jonathan has a 3 digit IQ. Now really 'nuff said.