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Re: Auto focus quit working
Make sure you have not set a dial control to say manual focus or Macro focus.
Run through the menu's on the screen to see if you have inadvertantly changed sometihg.
As you are computing - give Pentax Technical Support Team a a go on their website
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I do not think your lens is out of order.
Sometimes this happens.
If your lens is not out of order then lets think the problem is another thing according to the user.
Autofocusing is great but under some conditions such as below you may consider.
Shooting in dimly lit environments can be difficult for some cameras and lenses when it comes to focusing.
You’ll know when your camera is struggling in Auto mode when every time you go to take a shot the lens will whirl from one end of it’s focusing options to the other and back again before deciding on where to focus.
This can really lengthen your shooting process and make taking quick candid shots quite frustrating.
Switch to manual mode and you can quickly find your focusing point and get the shot you’re after.
Check you have not switched camera t manual focus...if it's on auto then try changing various focal lengths to see if it kicks in....if it does intermittently you may have a cracked flex cable...this eventually happens with long throw lens because the cable gets weaken as it stretches and closes.It is also possible the ribbon became dislodged at the Circuit board just behind the mount.
Your Sigma 28-300mm doesn't have a HSM-motor as far as i know. When you switch it from MF to AF, you also have to disengage the manual focusing ring by pulling it towards the camera, or pushing it away from the camera. Using the AF without unlocking the manual focusing ring may damage the AF motor.
I hope this helps,
Low light focus lock can be a problem with this camera. But in normal or bright light there should be no problem with auto focus lock.
If this is a new problem, you should check to see if a setting has been changed.
With so many options, it is easy to accidently set something that causes unusual results (been there, done that).
First ... Go to the Setup Menu and see that the "All Reset" option is selected. This will cause everything to be reset to factory default each time you power-on the camera.
Turn the camera off and then turn the camera on. Then take some test photos to see if your auto-focus-lock is improved.
If that works, there is no need to check the items below.
If that does not work, here are some control changes to try. Remember if you turn off the camera everything gets reset.
That camera uses contrast detection for auto focus and it is normally set to "Multi-Area Auto Focus". Try changing it to "Spot Auto Focus" and do some tests, including with the camera set to one of the programs or manual mode.
There is another setting called "Autofocus Area", you should investigate. Check your manual to determine what you can do with this control.
There is another control called something like "continuous auto focus". Check the manual for further information.
If none of the above help, it is time to see about some camera repairs.