The Bulb Ramping Timelapse mode allows you to take time-lapse photos with linearly changing exposures. In regular time-lapse modes, all the shots have the same exposure. This can be enough for most cases, but sometimes the light changes throughout the whole timelapse process and the shutter speed needs to be adjusted accordingly to avoid too dark or too bright pictures. Bulb Ramping Timelapse mode takes care of that. It has 6 parameters.
Movement: This parameter defines how much the device should rotate. Clicking the rectangular box on the screen opens the Angle Setup screen. The point A defines the starting position and the point B defines ending position of the movement. You can select the points by clicking the circle buttons on the bottom and change the position by using the slider on the top. Once the position is changed, an orange button will appear to save the new position.
CCW : Counterclockwise (Slide in this direction and your Capsule will rotate counterclockwise)
CW : Clockwise (Slide in this direction and your Capsule will rotate clockwise)
CW : Clockwise (Slide in this direction and your Capsule will rotate clockwise)
Frames Per Second (FPS) : This parameter defines the amount of individual video frames that your final video will have, per second. For a standard video, you can set this value to 24 or 30.
Play Time : This parameter defines the duration of the final video you want to create.
Initial Exposure : This value defines the shutter speed of the first shot. You can set a custom exposure up to 100 hours in milliseconds.
Final Exposure : This value defines the shutter speed of the last shot. You can set a custom exposure up to 100 hours in milliseconds.
Interval : This parameter defines the duration between each shot. The Interval may have a value from 13 milliseconds up to 100 hours.
How does it work?
Once you set all the parameters, click the Start button on the lower right corner. A status screen will open and your camera will start moving. You can see all the progress in the status screen. The status screen shows the interval and the exposure progress for each shot, the total movement progress, the elapsed time and the remaining time, In addition, the total number of photos taken is displayed instantly in the lower left corner.
The process starts with Initial Exposure. With each frame, the exposure will be changed towards the final exposure linearly. At the final frame, the picture will have the final exposure. The exposure value can have an ascending or descending change. This depends on the initial and final exposure values. The change of exposure will be the same between each frame.
Tip #1: The Bulb Ramping Timelapse mode has control over the shutter speed only if your camera is set to BULB mode. This is the only way of achieving custom exposures. If you do not set your camera to BULB mode, the exposure value of your camera will be valid and you will not get photos with the exposure set on the MIOPS MOBILE app.
Tip #2: The interval must be long enough to allow the camera to save the photo on the memory card. Otherwise, the number of photos taken will be less than shown on the screen.