Facial twitch: I believe these twitches are similar to the twitches people get in their eyelids. Usually it goes away within 6 weeks or so. There are other causes such as caffeine, stress, alcohol, electrolyte imbalances and excessive fatigue. Feel better.
A shutter speed of 1/30 for example will let in twice as much light as a speed of 1/60 since it is two times slower. When you decrease the shutter speed by a factor of two you are increasing the amount of light by one stop. Remember that fractions get larger as the number on the bottom gets smaller.
Checklist: Night photography. 1: Switch your camera to Manual mode by turning the mode dial to âMâ. 2: Choose the smallest f-number available and a relatively long shutter speed to record the lights. One second is a good starting point and most cameras indicate seconds using double quotes, so look for 1â.