Sony a (alpha) SLT-A55VL - Manual (Page 181)

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The shutter does not release.
• You are using a memory card with a write-protect switch, and the switch is
set to the LOCK position. Set the switch to the recording position.
• Check the free capacity of the memory card (page 32).
• You cannot record images while charging the built-in flash (page 96).
• The shutter cannot be released when the subject is out of focus.
• The lens is not attached properly. Attach the lens properly (page 26).
• When the camera is attached to another device, such as an astronomical
telescope, set [Release w/oLens] to [Enable] (page 151).
• The subject may require special focusing (page 86). Use the focus-lock or
manual focus function (pages 87, 90).
Recording takes a long time.
• The noise reduction function is turned on (page 149). This is not a
malfunction.
• You are shooting in RAW mode (page 143). Since the RAW data file is
large, the RAW mode shooting may take time.
• The Auto HDR is processing an image (page 107).
The same image is shot several times.
• The drive mode is set to [Continuous adv.] or [Bracket: Cont.]. Set it to
[Single-shot Adv.] (page 116).
• The exposure mode is set to Continuous Advance Priority AE (page 69).
• The exposure mode is set to AUTO+ and [Auto+ Image Extract.] is set to
[Off] (page 62).
The image is out of focus.
• The subject is too close. Check the minimum focal distance of the lens.
• You are shooting in manual focus mode, set the focus mode switch to AF
(autofocus) (page 85).
• When the focus mode switch is equipped with the lens, set it to AF.
• Ambient light is insufficient.
Eye-Start AF does not work.
• Set [Eye-Start AF] to [On] (page 39).
• Press the shutter button halfway down.