Paul wrote:
>
> 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.
Also the effective aperture will be the apeture set on the prime lens
multiplied by the factor of the teleconverter, e.g. 200mm set at f5.6 with
2X converter gives DOF as for 400mm set at f11.
Wayne Harridge
Ivanhoe, Victoria, Australia
http://www.geocities.com/Paris/Louvre/6152/
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