Photograph A Dark Object

Photograph A Dark Object - Moreover if the object is dull dark color. It makes lens always moves to get focus picture. It's caused by lacking of light from the object.

Camera requires enough light to do focusing and metering. Focusing done when you half press shutter button, focusing motor lens will move the lens to get focused  shadow to camera sensor, while camera calculating aperture and shutter speed according to the light get in.

Dark object bounces a few light, thus sensor doesn't feel change of intensity when lens is moved. If focus is successfully found, low reflection of light will cause sensor arranging shutter speed very slow, sometimes more than 1 second.

This problem could be solved with a couple ways:

1. Apply setting manually:

• Find bright object that same distance with the dark object.
• Set exposure mode to P, do focusing until camera calculate exposure successfully. Read the value.
• Shift exposure mode to M, and set aperture, shutter speed and ISO with the value.
• Set lens to manual focus.
• Take photos from different angles.

2. If there is no manual setting, however AE-lock and AF-lock are available:

• Put bright object parallel distance to dark object.
• Apply AE and AF locks.
• Do focusing and metering to bright object.
• Take photos with AE & AF lock applied to the dark object at the different scenes to get best picture.

3. If there is no manual setting, AE-lock, nor AF-lock:

• Put bright object parallel distance to dark object.
• Do focusing and metering to bright object.
• Hold half press shutter button.
• Direct camera to the dark object, and take the picture.
• Repeat these ways with different scene program to get best picture.

Hopefully become useful tips.