I have recently begun moving from a Nikon APS-C DSLR to the Micro Four Thirds camera while also transitioning from using a viewfinder to using the LCD screen for framing my shots. Because of the size and cost of lenses, I am now shooting with a 14mm (28mm equivalent) lens on the M43 camera instead of the 35mm (52.5mm equivalent) lens on the Nikon. I am getting used to shooting with a wider lens, but I am also curious how my change from viewfinder to screen use effects the actual field of view of the images. Since I no longer hold the camera against my face, the lens is positioned at least 6 inches further forward than it was when using a viewfinder. In other words, rather than going from shooting at 52.5mm to 28mm, I feel like the 28mm lens may behave more like a 35mm lens (relative to my own eyes) due to its different physical position relative to my body.
Do you have any information that can help me better understand the relationship between focal length, field of view, and camera-holding technique?