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FP sync, flash compensation, dynamic range

What is a high-speed sync flash?

bride with a bouquet

high-speed sync flash - is a powerful tool through which we are able to use pulsed light external flash at the highest shutter speeds camera.

for example, on a cloudless sunny day, we need to highlight the shadows on the face of the bride (pictured right: S 1/1000, F4, 50mm, ISO 100).
at the optimum aperture and ISO F5,6 100, we get a fairly fast shutter speed, for example, S 1/600 sec.

of course, the usual synchronization camera is not designed for the use of shutter speeds, maximum - 1/250 sec. If you shoot with the flash at shutter speeds shorter than 1/200-250 seconds. (depending on the capabilities of the camera) in the normal mode of synchronization, the frame will be illuminated by a light pulse flash only partially, and as a result we get underexposure with light horizontal bar.

So, to allow photographers to use external flash light short exposures, some Flashlights, for example, Nikon Speedlight SB-900 provides the possibility of using high-speed sync mode (FP). It should be noted that the camera must support this mode of synchronization.

When and why Flash compensation?

Flash output level compensation «EV» (negative or positive) is used to set an optimum picture exposure. For example, when the head of foreign flash at the ceiling or wall may be required to establish a positive correction pulse power, for example , +0,7 EV. Flash compensation can also be used in the case when using a long lens (telephoto) or when it is not too large aperture. The results of the amendment power can be monitored in the histogram to make timely adjustments to the picture's exposure.

What is different from the filter color filter?

color-filter put on the lens for correcting the intensity of light passing through the lens or correcting some color spectrums of light.

Colour filter (color filter) is usually worn on the light source, such as a flash for correction white balance, as well as to create all sorts of color effects in the image.

What is overexposure in photographs?

girl lying in white tank top

in the photographic medium, overexposure called bright areas of photos without any details, that is completely white areas or very close to this. See photo at right.

Relight - is the result of incorrectly installed exposure when taking pictures.
Photographers sometimes used as an artistic overexposure reception, such as "photo in a high pitched" where the photographer deliberately sets excessive exposure. Although, in my opinion, it is better to remove the original frame with normal exposure, and in the process of postprocessing in the graphical editor create the desired effects.

What is the dynamic range?

pine tree on the beach

This technical term to explain in a few words is difficult, but I'll try to describe it in accessible language, in your own words to you it easier to understand what is at stake.

Dynamic range (latitude) is considered to be the ratio of the brightest areas of the image to the dark. He characterizes the ability of digital camera simultaneously reproduce bright and dark objects. That is, the more detail in bright and dark areas of the picture (roughly speaking, the less contrast), the wider dynamic range.

Perfect dynamic range of the human eye has since ideally picks up contrasts of light and shadow, balancing reproduction of detail both bright and dark objects.

Almost all the manufacturers of photographic equipment for many years, "scratching their heads" on the development of light-sensitive material capable of transmitting the picture as well as qualitatively reproduces the human eye. But so far the most successful result of their efforts remains low contrast film, which, to date, its technical characteristics superior to the matrix digital SLRs. In general, the figure has room to grow and to strive for.

Which means "enlightened lens»?

lens jupiter-9

« Enlightened lens "- is a lens in which all lenses are coated on both sides with special thin layers, through which the lens has a high bandwidth of light as well as a positive effect on colors.

These lenses labeled on the case latin letters «MC», see. photo on the right.
But not only lenses can have multi-coated glass filters may also have such layers.

it is worth noting that the price of "enlightened" filters, as compared to conventional filters without the "enlightenment" is significantly higher, regardless of the name of the manufacturer and diameter.

What is responsible for the clarity of pictures?

Basically, at picture clarity affect the following points: the quality of the glass, the resolution of the lens and the light-sensitive material; exposure time, performance and focusing stabilization system; Adjusting the lens and camera; stillness and stability of the camera when the shutter button. That is, if the technical side of the summit but the photographer shaking hands, get a clear shot fail. In this case it is necessary to use a tripod and remote control (remote control).

How to sharpen photos when shooting on a bar of soap?

In other words, the most of dish soap to get clear pictures? As I mentioned above, we must first ensure that immobility camera when you press the shutter release button. In most cases, it is a slight movement of the camera at the time of the click leads to a blurring of the image. You also need to take into account the time delay when shooting.

Follow the shutter speed on the soapbox probably not easy, so it's best to take photographs in the daytime. If possible, avoid evening shoots and shooting indoors with insufficient lighting. If you still need to shoot indoors or in the evening, use the flash.

To shoot flash pictures were correctly exposed, without departing from the subject at too great a distance. This will prevent underexposure, to provide the necessary light intensity subject.


When to Use mode shutter lag?

mode shutter lag to some extent helps to avoid Motion blur when shooting at slow shutter speeds. Therefore, this mode is recommended for use in low light conditions when a tripod for shutter speeds below 1/60 sec. For example, at shooting sunrises and sunsets.

Does the image quality scratch on the back of the objective lens?

Yes, it does. The degree of negative impact on the quality of the image depends on where the scratch, from its depth and size. If the scratch in the center of the lens, or close to the center, it will inevitably lead to a loss of definition of the main subject. If the scratch is small and closer to the edge of the lens, it's not so bad, but still not good. Perhaps it was at this point is to be the main subject, and this will not allow scratch excellent image sharpness.


© Andrey Ko 2014***
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