RE the 1/3 in front 2/3 in back, that's the way DoF is distributed around the focal plane *for wide angle lenses* (ultrawides can be 30:70 or more). As the FL increases, the distribution trends to 50:50...by 100mm, it's 49:51.
RE the 1/3 in front 2/3 in back, that's the way DoF is distributed around the focal plane *for wide angle lenses* (ultrawides can be 30:70 or more). As the FL increases, the distribution trends to 50:50...by 100mm, it's 49:51.
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