I just got a Kenko MC-7 2X TC, intend to use it on my 80-200 f2.8. The loss of 2 stops of light to f5.6 isn't reflected by the camera, I could still dial to f2.8 with the TC attached.
My question is, do I need to dial to f5.6 myself (say in Av mode), to make sure that the exposure will be correct? I remember Edmund mentioning this in one of the threads. But then, Daniel from TCW told me that there is no need to, just shoot as normal. A nature photography website says the same thing. I tested the exposure of a same scene with and without the TC, at f2.8. Without the TC it was 1/15s, with the TC it was 1/4s (both at f2.8). This seems to show that the metering system has taken into account the loss of 2 stops of light already, is that right?
Need the answer by tonight as I will be using the TC tomorrow. Don 't wanna screw up the exposure.
oh yah one last question, when I use a 2X TC on a f2.8 lens, do I get the DOF of a f2.8 or f5.6? Cuz only less light comes in, physical diameter of aperture remains the same, means DOF still stays at that of f2.8?
My question is, do I need to dial to f5.6 myself (say in Av mode), to make sure that the exposure will be correct? I remember Edmund mentioning this in one of the threads. But then, Daniel from TCW told me that there is no need to, just shoot as normal. A nature photography website says the same thing. I tested the exposure of a same scene with and without the TC, at f2.8. Without the TC it was 1/15s, with the TC it was 1/4s (both at f2.8). This seems to show that the metering system has taken into account the loss of 2 stops of light already, is that right?
Need the answer by tonight as I will be using the TC tomorrow. Don 't wanna screw up the exposure.
oh yah one last question, when I use a 2X TC on a f2.8 lens, do I get the DOF of a f2.8 or f5.6? Cuz only less light comes in, physical diameter of aperture remains the same, means DOF still stays at that of f2.8?