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Ballistic Photography

Ballistics Photography refers to the area of photography concerned with taking pictures of bullets being fired from a gun or bullets penetrating their respective targets. The techniques involved with taking ballistic related photos are similar to those for any other subject of high-speed photography, such as pictures of splashing liquids or popping balloon.
As with any other specialized area of photography, ballistics photography demands a certain set of equipment. In addition to a high-speed flash, a photographer may also need a cable release and a trigger to align the flash with the event. The trigger, perhaps the most important piece of equipment, activates the camera to take the picture based on either the sound or light emitted from the high-speed event.
While a bullet shot out of a gun will have a trigger that is rigged to go off based on the sound of the gun being fired, the trigger will be set to be light-sensitive if it is attempting to capture a flash of lightning. For sound triggered shots, a photographer may also want to use a microphone to make the trigger extra sensitive to perceiving the first whispers of sound.
Although ballistic photography may be taken for artistic effect, it most often comes into play for scientific research and experiments.

Intro of DSLR

A digital single-lens reflex camera (digital SLR or DSLR) is a digital camera that uses a mechanical mirror system and pentaprism direct light from the lens to an optical viewfinder on the back of the camera.The basic operation of a DSLR is as follows: for viewing purposes, the mirror reflects the light coming through the attached lens upwards at a 90 degree angle. It is then reflected twice by the pentaprism, rectifying it for the photographer's eye. During exposure, the mirror assembly swings upward, the aperture narrows (if set smaller than wide open), and a shutter opens, allowing the lens to project light onto the image sensor. A second shutter then covers the sensor, marking the end of the exposure, and the mirror lowers while the shutter resets. The period that the mirror is flipped up is referred to as "viewfinder blackout". A fast-acting mirror and shutter is preferred so as to not delay an action photo.All of this happens automatically over a period of milliseconds. Fast cameras do this upwards of 10 times a second.DSLRs are often preferred by professional still photographers because they allow an accurate preview of framing close to the moment of exposure, and because DSLRs allow the user to choose from a variety of interchangeable lenses. Most DSLRs also have a function that allows accurate preview of depth of field.Many professionals also prefer DSLRs for their larger sensors compared to most compact digitals. DSLRs have sensors which are generally closer in size to the traditional film formats that many current professionals started out using. These large sensors allow for similar depths of field and picture angle to film formats.The term DSLR generally refers to cameras that resemble 35mm format cameras, although some medium format cameras are technically DSLRs.