Recommended Aperture Settings for Night Shots
Night photography has always been a challenge for many photographers, who may struggle with the correct ISO, shutter speed, and aperture settings. The lack of light source, plus the desire to correctly capture minimal light and detail, makes it truly challenging to get the right exposure combination. Most common night shots are city lights, concerts and events, or car taillight streaks.
Taking Night Shots
For static night shots, wherein you only have to capture city lights or stationary objects, it's not vital to keep the shutter speed at a minimum. You then have full reign on your aperture setting depending on your subject. Night shots would require you to have the widest possible aperture, to let more light into your shot. If your subject will benefit from a shallow depth of field, then you can set the aperture wide, such as f/1.4, f/2, or even up till f/4. If you require less depth of field - for taking wide shots or landscapes - then it's best to try and keep your aperture set at f/5.6 or higher, and simply adjust your shutter speed setting.
If you want to capture taillights or movements with motion blur, a longer exposure is required. Depending on your speed, you can keep your aperture at a minimum, setting it at f/8 or even lower than f/11.