That also means that you have sent a flash in the standing/sitting in front of you man, and direction of light flashes beat him in the face, and hoping to get quality portrait. But even in this light photos to documents can not be done, not to mention the portrait. Flash on the forehead can be used only in extreme cases when there is no other way to highlight object in challenging lighting conditions, as well as to illuminate the shadows in sunny weather - all.▲
First, you need to divide the picture quality on the two main components.
The technical quality of the image:
it is important that the shot was correctly exposed, that is, that in the photo, there were no hotspots (taken off parts of the image), or vice versa - too deep shadows. It is also important in the technical aspect of quality that has optimum image sharpness/detail and correct WB (white balance).
The artistic value of photos:
It is not so clear and simple as in the previous aspect quality, ie. a. there are a lot of nuances defining artistic value of a photograph. Artistic photo quality depends largely on the ideas, attitudes and the nature of the image, which should be properly built from the point of view of all the laws of composition. Its form and content should be properly underlined or highlighted in the right main and secondary facilities of the composition.
Before you enter into a warm room, put the camera in a sealed container and equipment, not breathable. It is possible to use several new plastic bags of various sizes. In smaller package laid the camera, and only then put the camera in a bag packed with a larger size. It should look something like a thermos (outside the body - inside the bulb). Read more in the article of digital SLR.▲
flash Guide No. «G» can be found in the technical specifications in the manual.
But if this manual you do not, you can find the guide number of the flash «G» by the formula:
G = 3 x 8 = 24.
3 - is the distance to the object «m»;
8 - this value lens aperture «f»;
24 - it found the guide number flash «G».
That is, if at a distance of 3m best results were obtained when the diaphragm 8, then the guide number - 24.
In the same way we can calculate the guide number on the calculator to the back of the flash.
For example, you have the flash controller with illumination angle (zoom), in this case, choose the mean value of the zoom (50mm) in front of which there are a number of distances «m». Of this series choose any distance «m», and the table of sensitivity «ISO», multiply the distance on the aperture value «f» (located in front of the parameter «ISO 100»). Thus you can find the guide number of the flash «G».
Hood, to some extent, protects the front of the lens from damage, splash water, rain, etc. Also, the lens hood prevents parasitic reflex light enters the lens inside the bulb that produces a sharp and clear pictures; in some cases - slightly increase the image contrast. Therefore, the hood can and should be used always and everywhere, when conditions permit.▲