>Use the focal length of the combination for the formula, ie for a 200mm + 2x
>use 400mm. The teleconverter magnifies the circle of confusion too.
>The image degradation will effectively reduce the DOF further.
>Many longer lenses, like the OM 300, 400, 600, 1000, actually have
>teleconverters built into them so they will be shorter than the focal length.
>
>Paul
Lenses are always called "tele lenses", if the built length is shorter than
the focal length, it's the definition of "tele lens" I think.
Matthias
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