Hi, Thank you for the replies.
If you point a camera at a scene to take an exposure reading the camera does not really no what is and what is not the correct exposure over the whole scene, same as if you place an object in a scene when you point the camera it does not no that it is that object that needs correct exposure, I hope I am correct so far?
When you use a meter it reads either the ambient light falling on the whole scene or the reflected light from an object that you point the spot meter at. The trouble with both of these options as far as I can see is that if you take the ambient reading in a landscape scene with blue sky, white clouds, darker ground etc in the scene then something is not going to be exposed correctly, if you take three reflective reading with the spot meter then you can find out the exposure between each and can compensate for that in your exposure.
This is why I ask what to use to get a mid tone reading in a scene.
The highlights and darks are easy, the white clouds and the shadow area of the scene.
I hope I am correct here? maybe something else I am missing.
On another note, the reason I like to use a hand held meter is I enjoy taking photographs in manual mode, working it out with the help of the meter, it just adds that (i don't no) something to IMO the end result or not in some cases with me.
Again thank you for the replies