Slow Shutter Cam lets you create all sorts of slow shutter speed effects with your iPhone/iPod by using one of the following Capture modes: Automatic, Manual or Light Trail. Capture modes can be selected after tapping the Capture Settings button, which is located at the left end of the toolbar.
Equivalent to the shutter priority mode on a DSLR, the Automatic mode is perfect for creating ghost images, waterfall effects or suggesting movement in your photographs by adding a blur. This mode also features automatic exposure compensation so that your pictures are always perfectly exposed, no matter what shutter speed is selected (under normal lighting conditions).
In low light conditions, the Manual mode allows the camera to accumulate every photon of light hitting its sensor. The longer the shutter speed, the more light it will accumulate. If the picture is over-exposed, you can compensate by using the Exposure control after the picture has been taken.
The Light Trail mode allows you to "paint" with light, show car light trails and fireworks or capture any other moving light. Unlike shooting with a DSLR and being tied to specific rigid settings to obtain good results, the Light Trail mode takes care of the essentials. The Light Trail mode also features a Live Preview that allows you to watch your work progress in real time.
The Shutter Speed setting allows you to decide how long the shutter will stay open or, if you prefer, the duration of the capture session. When selecting the B (Bulb) setting, the shutter will stay open until you close it by tapping the shutter button. In all case, an ongoing capture session can be terminated at any time by tapping the shutter button.
The sensitivity setting (only available for the Light Trail mode) allows you to set the sensitivity of the camera sensor or, if you prefer, how rapidly the camera captures light ('1' being the maximum sensitivity and '1/64' being 64 times less sensitive). The best way to really understand its impact is to try both minimum and maximum sensitivity while watching the Live preview.
The Live Preview allows you to watch your work progress in real time. To display the Live Preview, tap the LP button, which is located in the upper-left corner of the display. Camera preview will then shrink to become a medallion in the upper left corner of the display. To hide Live Preview and return the camera preview to the full screen, simply tap the medallion.
Available in Automatic and Light trail modes, the Freeze control allows you to put more or less emphasis on the first or last frame of a capture session. Moving the slider to the left will put more emphasis on the first frame, while moving the slider to the right will put more emphasis on the last frame.
To really appreciate its behaviour, select the Automatic mode, set the shutter speed to one second and pan slowly over a stationary subject that has a uniform background (like a frame on a wall). Just make sure that the subject always stays in the camera's field of view. After the capture, move the Freeze control slider to the extreme right and then move it slowly toward the centre. As you move the slider, a trail will begin to emerge behind the subject.
This control can be displayed by pressing the Edit button (located in the middle of toolbar) after a picture has been taken. Also, its default value can be restored by double tapping the display.
The exposure control let you adjust the exposure of your pictures. Even if this control is available after the images have been taken, it is really an Exposure Compensation function. Unlike a brightness control, details lost in the saturated area can be recovered. Because of the way in which the Light Trail mode works, this control is not available in this mode (but we are considering adding a brightness control in the next version).
This control can be displayed by pressing the Edit button (located in the middle of the toolbar) after a picture has been taken. Also, its default value can be restored by double tapping the display.
If a tripod is not available, you can try to press the side edge of your device against something solid to minimize movement. In all cases, using the self-timer with a one-second delay will give you the time to stabilize your device before the shutter fires.
In low light conditions, you can use Slow Shutter Cam to compensate for the lack of flash. However, you will need to hold your device firmly to avoid introducing a blur (see Minimizing movements). Select the Automatic mode with a shutter speed of 0.5 sec, aim the camera at the subject and tap the Shutter button. After the picture has been taken, use the exposure compensation slider to fine tune the exposition of your picture. To improve the picture quality, select a longer shutter speed and compensate less the exposition.
In very low light conditions, or for extreme effects, select the Manual mode and a Shutter speed. The longer the shutter speed, the more light the camera will capture. Again, the iPhone must be very steady or the picture will be blurred (see Minimizing movements). Due to the nature of the camera sensor, there could be extensive noise when used in dark conditions. To minimize noise, select a longer shutter speed and compensate by moving the exposure slider to the left after the picture has been taken.
To capture fireworks, we invite you to consult this nice little tutorial written by a user.