Depth of Field (DOF) means depth. in the field of photography, DOF is technically means that the variation range or distance between the camera and the subject of the image to produce variations in the sharpness (focus) the picture can still be accepted (no blur). so, DOF is used to indicate a specific room in the photos that get special attention by eye because of differences in sharpness (focus).
Depth Of Field is influenced by 3 things, namely:
1. Distance from the main focus of the camera.
Wide space with a sharp straight proportionate square distance objects. If we change the distance between the camera and the object of 3x (more friction with the camera back from the original position) the width of space will be a sharp 9x original width.
2. Aperture diaphragm
Wide space with a sharp straight proportionate diaphragm. Example: if the diaphragm was 2 stop of f / 8 to f/16, so wide space will be a sharp 2x original width.
3. Focal length lens is used.
Wide space sharply inverted proportionate length of the focus square. In other words, the wide space will be a sharp 4x wide-back if we change the lens from 50mm to 100mm (focal length lens half of the original).
The wide angle lens then the wide area space sharpness. This means, when the camera is in zoom-out, shoot the object that we will be more free to move forward or backward within a specified distance from the camera and still look sharp / focus. Sharp narrow space in the telephoto image, also called narrow DoF, while striking a wide space in the image is also wide DoF wide.
The more open the diaphragm, the more narrow the space sharpness. This means, set the focus in situations that are less lighting would be more problematic as the diaphragm must be opened wide and the object will not be free to move near or far from the camera as it would be out of focus (out of focus).
The combination of telephoto (zoom in all the way) and the diaphragm is wide open, will result in a sharp narrow space. One example, when taking telephoto pictures (tight shot) a singer who perform a concert at night with minimal lighting, we must carefully manage the focus, because only a few performers are moving near or far from the camera, then he will be easy to out of focus.
Introduction of Depth Of Field (DOF).
Introduction of Aperture and ISO
APERTURE and ISO is the need to be understood by a good photographer not just for a hobby but also for who wants be a professional photography beside SHUTTER speed. APERTURE is the size of the lens that serves to enter and forward to the film or light sensor, the size is set through the size of the diaphragm. number of the camera, in general, contained 2.8; 4; 5.6 ff. the numbers, known as f-number, so called APERTURE (opener) f / 2.8, f / 4; f / 5.6 ff. APERTURE The greater the f-number small and the small diameter also, f/16 so diameternya smaller than f / 5.6
How it works similar APERTURE pupil on the human eye, the more incoming light, the smaller pupil diameter, as well as vice versa. APERTURE space is related to the sharp or depth of field, the larger f-number, eg f/22, sharpness of the range will be wide. This means that objects in the back and in front of the main focus has good sharpness. otherwise we will get blur effects / objekdi diagram for front and behind the main focus when using a small f-number, eg f / 2.8
Shutter speed and APERTURE should get together for Exposure appropriate. ISO role is also important, the higher the ISO is used, the sensitivity to light is the greater, so the lighting was poor, and APERTURE SHUTTER speed can still be used maximally. But keep in mind, the higher the ISO is used, will be the higher level noise or grain produced.
Exposure to know whether appropriate or not, the digital camera or conventional metering facilities available. So that the occurrence of over Exposure (excess lighting) or under Exposure (lack of lighting) can be minimized.
After understanding the basic techniques have been mastered, the next practice is needed, because the art of photography is identical with the moment, and a good moment not easily repeated, skill composition and determine the point of image capture can be developed over at least someone doing a lot of practice, the other is to improve of reference, books, internet, and other sources. how good a camera is only a tool, which determine who is behind the camera.
Shutter Speed Camera Digital
Today, digital photography is growing rapidly , and automatically leave the conventional ways that require extra time and cost to see a result, the digital photography easier for us to understand the photography, the images can we see at the LCD and enables us for evaluation quickly, because of technical data relating to the images seen and recorded before, different from the Conventional Photography, we must to print them first before we can see and evaluate the results of our photos, technical data will be our first record, so it takes a lot of spend cost and time to be able to improve the ability of our photography.
Photography digital art as painting with light, in this case the camera and lens that replaces the role of brush and paint. There are two things that hold the most important role in the camera and lens, the Shutter Speed and APERTURE.
Shutter Speed is the length of time needed to illuminate what the CMOS sensor on the CCD cameras and conventional film in the camera. Camera shown on the figures 250,125,60,30,15 ff. This means that the duration of irradiation is 1 / 250 sec, 1 / 125 sec, 1 / 60 seconds, atc.
The bigger number means faster time to use, this will create the effect of the still (freeze), for example, we will photograph objects that are moving, eg car, with the effect still, we need at least SHUTTER speed above 1 / 125 seconds
Conversely when we will be taking effect with the object moves, then the required SHUTTER speed of less than 1 / 125 seconds, preferably carried out by following the movement direction of the object, this technique called panning,
Two things also from the above depending on the speed of the object moves, the more rapidly moving object, it means that the higher the SHUTTER speed needed to acquire still or moving effects that we want, Note, the lower the SHUTTER speed, will also lead to the greater possibility of a camera shaking , which will cause the results to be rocking and the stapler is not sharp
To be safe, use the SHUTTER speed above 30 or 1 / 30 seconds, I really want SHUTTER lower speed, eg 1 / 15 sec, 1 / 8 seconds or less, use it or use a tripod..
