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Gday Freddy
Most people believed that the critical backfocus distance was initially set at a std 35mm Film camera on the back.
Later comments were it now includes the length of a microfocusser as well.
However, the big problem is associated with SA
Whilst an SCT ( or ACF ) can theoretically project the image plane way out behind the rear, the SA also grows worse as you go from the critical design position.
Several users on the Yahoo groups have done empirical tests, but i cant ever remember seeing anything definitive.
Andrew
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