Blitz is one part accesories, which is used widely in the world of photography. Its main function is to illuminate objects to the lack of light exposure with either. But recently started to spread its use to produce artistic photographs. However, flash it is one thing that needs to be learned. Most of the readers are of course often use flash well and get good results, too, but this is will discuss the basic knowledge needed to properly use flash. True survived in theory can be accepted and survived in the correct use of a base that can be explained scientifically.
Using the flash is not only a light flash, the camera directing and then click the image and be one of the light and beautiful, but there are things that we need to know in order to get a good photo paper and correct it. We look good digital camera as art or technology, the flash is still a means to simplify, optimize, and enhance creativity.
Meters, Aperture and Shutter Speed
Photography briefly often defined as the use of paint with light. In the conventional photography using film, we ‘paint’ with a light layer on the film. The term is permanently burn the movie using light with a certain intensity. The intensity of light entering the film or CCD / CMOS digital camera on this must be right. Excessive lighting will cause the results of washed-out images (commonly called over-exposure/OE) and the less lighting will cause the results of dark images (commonly called under-exposure/UE). And how to get the right light?
We know what is lightmeter in the photography world. Lightmeter a built-in in the camera body and there is also a handheld. That we normally use is lightmeter built-in. Lightmeter we use to measure the light reflektif into the lens we (if TTL) and the processor will determine whether the camera is in accordance with the type of movie that we installed in the camera. In auto mode, or programmed auto, the camera will automatically find the right combination of f / stop and Shutter Speed (explanations follow). In the aperture priority mode (A / Av) camera will use the f / stop, which we select and determine Shutter Speed of the match. Conversely, the Shutter Speed priority mode (S / Tv) camera will use the Shutter Speed, which we select and determine the appropriate aperture. In manual mode (M) we will have to determine the appropriate combination meters guided by the camera.
Aperture or shutter openings is the width of the hole opened by the camera to allow the incoming light. Usually with f / stop. This figure is a result of the multiplier sqrt (2). That are commonly used usually starts from 1.4, 2, 2.8, 4, 5.6, 8, 11, 16, 22, etc.. To remember, the higher the score the more small . Because it is written as usual denominator fraction as f/1.4, f / 2, f/2.8, f / 4, f/5.6, f / 8, f/11, f/16, f/22, etc.. Aperture is also associated with the DoF (Depth of Field) or the space that could be sharply defined as a room in front and behind objects that are still in reach of focus entrance. DoF is itself influenced by 3 things, namely:
1. f / stop where f / greater DoF will provide a more wide (more regional focus).
2. The distance of objects where objects are far more focus will cause the DoF also increasingly wide.
3. The use of the lens where the lens will give the White DoF more narrow than wide angle lens (wide angle).
Shutter speed or shutter speed is the length curtain shutter is opened to allow the incoming light. This figure disimbolkan with the second unit and increase / decrease in the form of multiple ½. Example: 30s, 15S, 8s, 4S, 2s, 1s, 1/2s, 1/4s, 1/8s, 1/15s, 1/30s, 1/60s, 1/125s, 1/250s, 1/500s, 1/1000s, 1/2000s, 1/4000s, etc.. The slower the light entering the more.
Measured by a meter that is the camera light intensity entering it. If the meter shows the lack of light, then we can zoom f / stop or slow the Shutter Speed. Conversely, if the excess light meter showed we can increase the f / stop or speed Shutter Speed. One thing to remember is that the slower Shutter Speed then the greater the chance of objects blurred because of movement, vibration camera, or the movement of objects themselves.
Blitz and GN
To share / classifying flash, there are several classifications that can be used. The first, based on the availability of the camera flash is divided into the built-in flash and external. Built-in flash came from camera own an external flash while the flash is the additional cable or connect using the hot shoe to the camera. In addition, we also can share based on the type / brand camera. We know a dedicated flash and non-dedicated flash. Dedicated flash flash is made to use the special features in a certain specific camera. Usually, the producers issued a flash camera that also specific to the organization and can use features such as TTL, slow sync or rear sync, etc.. Meanwhile, non-dedicated flash has a function only of the most common camera and can be used irrespective of the type / brand camera. It is this type of flash, which usually require more counting because the flash is dedicated already received information from the camera lighting so that it does not require additional settings again. There are also flash the power output (GN) can be regulated and there is also that can not be (fixed GN). We tend to be more about the flash of non-dedicated, non-TTL, and fixed GN.
In using flash photography, we will not be separated from the calculations related to the intensity of light that reflection return of the objects that we lighted. Therefore, we will meet with what is often called GN (Guide Number) or the strength of the flash. In short, we can say if flash be large, it will be one lighting objects with more light and can reach a more distant object.
GN is in essence a simple calculation of the strength of the flash. We know 2 kinds of writing GN is using a different calculation unit, namely m (meters) and feet (feet). Normally we use in the calculation m. This is one of the considerations due to the flash with the same strength, the number of GN m and feet far different. In addition, the GN generally written for the film with ISO / ASA 100 and wide angle (35mm/24mm/20mm).
GN is the result of the times the distance between the openings (f / stop, or aperture) on certain conditions (ISO / ASA 100/35mm/m or ISO / ASA 100/35mm/feet). For example, if we want to use flash to take pictures of someone standing in the distance 5m from the 35mm lens we use and we want to use f/2.8 then we need the flash GN-ber 14. Calculations are normally used usually had to find appropriate aperture flash certain. For example, with flash GN 28 to photograph the object distance of 5m is we will use f/5.6.
GN is a guide for photographers. The price is not dead. Affecting some. One is the ISO / ASA used. Each stop on the increase 1 ISO / ASA will cause the increase of GN sqrt (2), or approximately 1.4 times (or farthest distance multiplied 1.4) and increased 2 stop on the ISO / ASA will cause the GN increased 2 times (or farthest distance multiplied 2 ).