Question about Sigma HF 28-80mm f/3.5-5.6 Aspherical Macro Lens for Canon AF
In all probabilities, the mirror lock-up feature of the camera is on. When the mirror is locked in the upright position, the optical viewfinder will go blank. This will also prevent the AF from working. If the mirror lock-up feature is not on, then the camera's mirror box could have been damaged. If this is the case, then the camera would require a minor repair (alignment of mirror) by a service center.
Posted on May 13, 2010
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Posted on Jan 02, 2017
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