photography theory&practice dark/bright field practice

dark/bright field practice

Dark/Bright Field Lighting,

Dark/Bright Field Lighting

in photography all glass objects, are difficult to photograph without using a proper technique, this is because many of these objects are for example transparent or because simply reflect everything that is around them, creating distractions.

dark field lighting

You have to use a dark background. If you use a completely dark background our glass object will not have a form, the only way to overcome this is by highlighting the edges of the glass.

The edges are illuminated by a bigger light of the background which is placed right behind itThe black card is seen through the body of the bottle, but the edges are defined by the light that goes behind the black card and reflected by the v-card

Bright field lighting

In the bright field lighting you must do the exact opposite to what we have done in dark field.

the body of the glass appears to be white

The edges are defined by dark cards that create negative light.

Even in this case, the background light is limited to the smallest possible space to reduce reflexes.

Photographic theory and practice- Light meter and metering modes

Light meter and metering modes

To take a photo of a subject exactly as it is, or as you imagine it, accurate measurement of the light on and around the subject is vital. The measurement of this light is called "metering." 
Metering is how your camera determines what correct shutter speed and aperture should be, depending on the amount of light that goes into the camera and the sensitivity of the sensor

Metering options often include partial, evaluative zone or matrix, center-weighted and spot metering.

You can see the camera meter in action when you shoot in manual mode, look inside the viewfinder and you will see bars going left or right, with a zero in the middle

If you point your camera at a very bright area, the bars will go to "+" side, indicating that there is too much light for the current exposure setting.
If you point your camera at a very dark area, the bars will go to the "-" side, indicating that there is not enough light.
You would then need  to increase or decrease your shutter speed to get to "0', which is the optimal exposure, according to your camera meter

Zone System

The Zone System is a technique that was formulated by Ansel Adams and Fred Archer back in the 1930's. It is an approach to standardised way of working that guarantees a correct exposure in every situation, even in the problematic lighting.

Middle Grey

The camera metering is designed to give correct readings under average circumstances. This means that the camera would look at the scene and try to render it as average reflectance (18% reflectance), which is middle grey ( a value between pure white and pure black). When a scene contains too much bright, however, the camera tries to provide it as average so it darkens it causing under-exposure.

In the opposite direction, when a scene contains too much dark, the camera tries to render it as average so it causing over-exposure

reflected Metering, incident metering

Because reflected metering reads the intensity of light reflecting off of the subject, it is easily fooled by variances in tonality, color, contrast, background brightness, surface textures, and shape. What you see is often not at all what you get. Reflected meters do a good job of reading the amount of light bouncing off of a subject.

Because incident metering reads the intensity of light falling on the subject, it provides readings that will create accurate and consistent presentation of the subject’s tonality, color, and contrasts regardless of reflectance, background color, brightness, or subject textures. Subjects that appear lighter than middle grey to your eye will appear lighter in the finished image. Subjects that are darker than middle grey will appear darker. 

theory and practice- motion

Motion

There may be many situations we decide to photograph something in motion, to do this we can use techniques that lead to different results..

If you would like to freeze the motion of the subject along with the motion of the background, you should use a very high shutter speed. I would use a shutter speed of at least 1/300th of a second in order to make sure that you freeze everything. But there are other subjects you might find that will be moving unusually fast such as cars or thrown objects. If you would like to freeze a faster moving object you will probably need to use a shutter speed closer to 1/1000th of a second or faster

This is an example of my photos where I try to photograph a moving subject, I believe that the photo is not very successful because the image is not entirely well in focus

Slow shutter speed can be used to blur elements or subjects in a photo to transmit how fast everything is perceived from the viewer.

It is suggested that 1/100th of a second should get to the seeked. For example it is used for more artistic photos of passing motorcycles or cars as well as running animals.

This is a technique best used when the photo scene full of bright colors. 

in the second image, the photo appears almost completely blurred, this is because while I took the photo did not have a tripod that helped me to hold the camera, in these type of photos is very important that the camera remains in position for the duration of the click

Harold Edgerton

Dr. Harold E. Edgerton, professor at MIT and inventor of the electronic flash, devoted his career to recording what the unaided eye can’t see. His photographs illustrate such moments as: a bullet seen the instant it explodes through an apple, a perfect coronet formed by a milk-drop splash, and a football dented by the contact of Wes Fesler's booted foot. These images have become some of the classics of modern art and science.

Dr. Edgerton was the first to take high-speed color photographs and was a pioneer of multiflash and microsecond imagery, which he used to take detailed photographs of hummingbirds in motion, as well as the progression of athletes' movements. These amazing images have shown us things we were never able to see before, in photographs that are as remarkable for their precision as for their 

seth casteel

Award winning seth casteel has captured moments where dogs break the surface of water creating sensational effects.