Speed is the parameter I use very rarely because I'm not often confronted subjects with very fast movements and I'm not a blur fan generated by deliberately slow speeds.

On most analog cameras of the 80s, the shutter speeds were accessible via a rotary knob accessible on the top of the case. This is still true today digital cameras FUJIFILM X. On the housings modern DSLRs as with the NIKON D7000, controlling the opening and/or speed is now happening in one place greatly facilitating the photographer responsiveness. Ergonomically NIKON cases, the speed is displayed on the top LCD panel and can be changed according to diametrically opposed knobs to trigger as the aperture.

Set the shutter speed returns to control the speed of an essential element in the photographic case : The shutter. This is nothing but a curtain, a component placed in window front that opens more or less rapidly, to control the length of time it is allowed to light to impress the film or CMOS / CCD sensor. This curtain is a thin carbon foil, metal or cotton, very delicate, it is better not to touch. This curtain is more complex that there are actually two : a first curtain and a second curtain.

The two images above show the impact of the speed choice on the final image. A speed of 1 / 1000th sec freezes torrent (picture A) while a fitting 1 / 60th sec (picture B) reveals the water movement as a trail. It all depends on the effect and the result that is to be produced in the image with creative potential.

Fast speed to freeze action

Slow speed

Long Exposure (B or T) with tripod

Freeze the action suggests that using very fast shutter speeds.

The use of very high speeds (1 / 500th to 1 / 2000th or more) is meaningless to crystallize in detail the fall of the skier in the remarkable image during an FreeRice World Tour Qualifier edition at Chamonix in 2009.

Copyright Pierre Stévenin
It is too often forgotten that the creative power of deliberately slow exposure. However, lowering the shutter speed between 1 / 60th and the second, it becomes possible to produce superb trails or "paint" with light accompanying the subject movement as with a video camera or transmitting custom movements to the device during exposure. The image is the excellent "painting" demonstration of my mentor.

Copyright Bryan F.Peterson
The long exposure with the camera mounted on a tripod allows indoor photography dark monuments, the night scenes or even capture scenes without astronomical instrument like the moon, planetary conjunctions, star trails or alternatively, the very rare bright comets. The long exposure lasts from a few seconds to minutes depending on the brightness of the subject and the final effect expected. Since 2015, especially in churches, I could withdraw myself definitely have a tripod with me thanks to notable progress in the digital high ISO.

Copyright Gérard Thérin





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