Introduction Blitz / Flash Light on the camera.

This is a frequently used accessories in the world of photography. Function is to provide enough light on the object, so that the lack of light exposure with either. But later expanded its use began to produce artistic photographs. in general, now, the digital cameras comes with the flash / flash, the camera integrates with the body and there are must add them.
Using the flash can not be done of any kind but you must consider when and wherever you need to use Blitz / flash, so that will be a work of photography is good.

Blitz and GN (Guide Number)
To share / classify flash, there are several classifications that can be used. The first, based on the availability of in camera flash is divided into the built-in flash and external. Built-in flash comes from the camera own while external flash is flash through additional cables or hot shoe to the camera. In addition, we also can share based on the type / brand camera.

Dedicated flash and non-dedicated flash.
Dedicated flash is a flash that is made specifically to use certain features in a specific camera. Usually the manufacturer issued a flash camera that also for the specific range the camera and can use features such as TTL, slow sync or rear sync, etc.. While non-dedicated flash functions have a common course of most of the camera and can be used irrespective of the type / brand camera. This type of flash that usually require a lot of calculation because the flash is dedicated lighting already obtained the information from the camera so that it does not require additional settings again.

There is also the output power of the flash (GN) can be arranged and there are also who can not (fixed GN). We will likely discuss more about the flash of non-dedicated, non-TTL, and fixed GN.

In the flash photography, we will not be separated from the calculations-calculations related to the intensity of light from objects behind reflection that we lightness. Therefore, we will meet with what is often called the GN (Guide Number) or the power flash. In short we can say that flashnya be at large, it will be light one object with more light and can reach a more distant object.

GN is in essence a simple calculation of the strength of flash. We know 2 types of GN with the use of a different calculation that is m (meters) and feet (feets). Often in our calculation with the use m. This is one of the considerations also due to flash with the same strength, number and m GN different feet away. In addition, GN is generally written for the film with ISO / ASA 100 and wide-angle (35mm/24mm/20mm).

GN is the result of the time distance between the openings (f / stop or MANUAL) on certain conditions (ISO / ASA 100/35mm/m or ISO / ASA 100/35mm/feet). For example, if we want to use flash to photograph a person standing on the distance of 5m from the 35mm lens we use and we want to use f/2.8 then we need flash GN-ber 14. Calculations used APERTURE usually find it appropriate for a particular flash. For example, with a GN 28 flash to photograph the object distance of 5m is we will use f/5.6.

GN is only a guide for photographers. Not a fixed number. One of them is the ISO / ASA is used. Each increase of 1 stop on the ISO / ASA akan GN increasing cause of sqrt (2) or approximately 1.4 times (or farthest distance multiplied 1.4) and 2 stop increase in ISO / ASA GN akan cause increased 2 times (or farthest distance multiplied 2 ).