Originally posted by lister6520 Long exposures can result in equally long delays during which the camera appears to be frozen. In other words a five minute exposure would see the camera 'frozen' for another five minutes after the shutter has closed. This is not actually a fault but just the camera doing what it is meant to according to the settings. The K-30 has what is called dark frame subtraction, which is set to 'auto' in the default settings.
What it does is that right after the end of the long exposure shot it will shoot a second photo of the same exposure but without opening the shutter. This may sound pointless but what it is doing is taking an image of one type of noise that sensors are prone to specifically in long exposure, the result of so called 'dark current' (no, it has nothing to do with dark matter). This is a type of noise which is repeatable meaning that if you take two photos after each other they will have exactly the same pattern of this type of noise (there will also be the 'normal' random noise which cannot be removed by this system).
Shooting the 'dark frame' allows the camera to subtract this noise from the photo.
When in 'auto' setting the camera will decide whether or not a dark frame subtraction would be beneficial. The decision is based mainly on the exposure time, the ISO and the temperature of the sensor.
If you want to avoid the long delay turn this function off by going to the camera settings menu 3, second item 'Slow shutter speed NR' and set it to off.
Exactelly what I was gonna say.
If it only happens in long exposures, don't worry, as it normal.
Zorza