The lens operates smoothly and reliably, with no functional issues reported. ✔ - Model: EF 17-40mm F4L USM. ✔ C:Model: EF 17-40mm F4L USM. ✔ C:Focus Type: USM (Ultrasonic Motor). ✔ - OpticalCondition : No haze, mold, scratches, balsam separation, or significant dust.
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