Focus device (11) for an optical system having a carrier and an lens attached thereto, including:a first steering section (13) designed or fitted to the support;a second steering section (15), which forms a support for the lens,at least one spring element (22, 23) which forms an elastic connection of the first steering section (13) to the second steering section (15); andan actuator (35) to adjust the second management section (15) to the first management section (13) in and against an adjustment direction (V);where at least one spring element (22, 23) is surface-formed at least in a range, characterised by at least one spring element (22, 23) having at least one stiffening range (50), in which a first surface part (51) of the spring element (22, 23) is perpendicular to a second part (52) of the spring element (22, 23) along a bending edge (54).
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