* Mercury vapor lighting can be cast out using a red filter
Monday, June 11, 2007
Shadows in the clock tower
* Mercury vapor lighting can be cast out using a red filter
Monday, June 04, 2007
Superman
Depth of field is one of the ABC's of photography every avid photographer needs to know.
Depth of field is the zone of sharpest focus around the subject. It is the distance from the focus point where the image is sharp and everything else gets more blurred. The depth of field itself may be altered as required based on the kind of shot a photographer wants. The depth of field can be changed by the following factors:
* increasing f stops will increase depth of field as it reduces the aperture size and hence critical focussing is required. Effectively increasing f stop (reducing arperture size) will make everything to be in sharper focus
* Depth of field also depends on distance, farther the subject better the depth off field
* focal length. Shorter the focal length, deeper is the depth of field. Wide angle lenses produce more depth of field than telephoto lens for a subject at the same distance
Reflections of heaven
Filtering is another very important element of photography which diffrentiates between a good photograph and an extraordinary photograph. Some of the diffrent types of filters are as follows:
* Color compensation filter - These correct color shifts - available in 6 basic colors
* Diffusing filters has glass that is mottled or etched to break up the definition of the image slightly. They also conceal details and can help to creat halos around subjects
* Fog filters cut down on both colour saturation and contrast
* Light balancing filters - These help to balance the kind of light that is being used.
* Neutral Density filter can be used to limit the depth of field to a narrow zone. They are also used to limit the amount of light entering the camera
* Polarizing filters - Daylight is partly polarized. Polarizing filter allows light through one plane only. Polarizing filters absorb quite a lot of light and you will need to adjust the exposure by about 1 1/3 stops
* Ultraviolet filters - Reduce the bluish tint caused by UV radiation
* Yellow filters block the path of blue light, magenta blocks green and cyan filter blocks red light
* Graduated filters are toned over a part of the area with the remainder of the area clear