The central AF sensor is almost always the most accurate

Started Jun 24, 2012 | Discussions thread
SteveL54 Senior Member • Posts: 2,696
Re: The central AF sensor is almost always the most accurate

ThePaleRider wrote:

As an aside for a moment, I am not sure that I understand your distinction between depth of field and depth of focus . They both represent the same thing in the two very differently sized scenes; one in front of the lens (depth of field) and one behind it (depth of focus). Is there not a linear relationship betwen the two, the same as all other dimensions in both scenes, which renders any distinction pointless other then in terms of semantics?

Depth of focus has a reciprical relationship to depth of field as it relates to image magnification. Depth of focus actually decreases with decreasing focal length for a subject at constant distance. The decreased depth of focus normally encountered with ultra wide angle lenses actually makes lens positioning relative to the sensor more critical than with telephotos.

Steve

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