Originally posted by Ash Did you perhaps have a dark frame subtraction being processed when you took the batteries out? This is a frame the camera takes after a long exposure to control noise, and is processed immediately after your long exposure. If you noticed the top LCD display, it might have been flashing to indicate it was processing the shot. In these cases, you will need to wait for the exact same time as you had the shutter open for the shot, otherwise you will lose the image. Sounds like this is what happened with your attempt.
K-r doesnt have top LCD, also there was no indicator that the image was being processed. Like when we shot a HDR image, it does say processing after taking the shot.
My camera was totally blank like its frozen
Btw how much time does it usually take for processing after taking long exposure shots like 45mins?