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In your diagrams the top one is correct, the others are in error.
The second diagram - the lens is still 44mm and no longer focuses on the sensor, hence the need to move the sensor or add back a filter element
The third is incorrect as the Lens has a fixed focus of 44mm.
{edit} This is based on the lens being focused on infinity. Obviously you can refocus the lens (within limits) to compensate, but the infinity focus doesn't change.
Last edited by Merlin66; 04-02-2022 at 08:50 AM.
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