A lens unit comprising: a lens barrel; a plurality of focus lenses (M1, L1, M2, L2) arranged in a sequence such that light passes through the plurality of focus lenses in that sequence provided inside the lens barrel; a plurality of actuators (106A, 106B) respectively corresponding to the plurality of focus lenses and configured to move each of the plurality of focus lenses inside the lens barrel; and a control circuit configured to control movement of the plurality of focus lenses, using the plurality of actuators, according to a first rule in a case of a position of at least one of the plurality of focus lenses being outside a designated range, whereby the at least one focus lens satisfies a preset modulation transfer function with respect to another of the plurality of the focus lenses inside the designated range and does not satisfy the preset transfer modulation function outside the designated range, the first rule being different to a second rule in a case of the position of all of the plurality of focus lenses being inside the designated range, wherein the first and second rules correspond to different movement profiles indicating a relationship between an amount of blur and an amount of movement of each focus lens, the second rule prescribing positional relationships between the plurality of focus lenses so that even if the focal length is changed, the amount of blur at the changed focal length satisfies a pre-set value, and wherein the pre-set amount of blur is also satisfied if the movement of the plurality of focus lenses is prescribed by the movement profile of the first rule, but whereby the range of motion for the at least one focus lens is shorter when the movement is controlled according to the first rule compared to when the movement is controlled according to the second rule. a lens barrel; a plurality of focus lenses (M1, L1, M2, L2) arranged in a sequence such that light passes through the plurality of focus lenses in that sequence provided inside the lens barrel; a plurality of actuators (106A, 106B) respectively corresponding to the plurality of focus lenses and configured to move each of the plurality of focus lenses inside the lens barrel; and a control circuit configured to control movement of the plurality of focus lenses, using the plurality of actuators, according to a first rule in a case of a position of at least one of the plurality of focus lenses being outside a designated range, whereby the at least one focus lens satisfies a preset modulation transfer function with respect to another of the plurality of the focus lenses inside the designated range and does not satisfy the preset transfer modulation function outside the designated range, the first rule being different to a second rule in a case of the position of all of the plurality of focus lenses being inside the designated range, wherein the first and second rules correspond to different movement profiles indicating a relationship between an amount of blur and an amount of movement of each focus lens, the second rule prescribing positional relationships between the plurality of focus lenses so that even if the focal length is changed, the amount of blur at the changed focal length satisfies a pre-set value, and wherein the pre-set amount of blur is also satisfied if the movement of the plurality of focus lenses is prescribed by the movement profile of the first rule, but whereby the range of motion for the at least one focus lens is shorter when the movement is controlled according to the first rule compared to when the movement is controlled according to the second rule.