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Backfocus — Focus behind the desired plane of focus. (Some photographers might call this a “near sighted” lens). For converted infrared cameras, the amount of backfocus will depend on both the thickness of the replacement glass over the sensor, as well as the optical properties of the lens itself. Removal of the sensor glass entirely can result in severe frontfocus, problematic on lenses that cannot focus past infinity.

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focus good

focus good
Correctly focused (top) and backfocused (bottom)
(click for larger image)

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