#Focalpoint 2 free download series#
When holding the shutter button down to take a series of images, in quick succession, the camera may or may not try to refocus each time. It may try to refocus, for seconds, missing the shot entirely. The camera guesses and tries to focus on the birds, therefore it does not take the image the instant the shutter button is pressed. The photographer knows he/she is ready to take the image but the camera does not.The camera doesn’t know if the photographer is trying to take the image or focus on the birds.The shutter button must take the image the instant it’s pressed or the birds will be gone.The photographer has selected the perfect focus, exposure settings and focal point within the scene, preparing to take an image of birds flying by very quickly. The photographer, in turn, misses the shot. Instead of taking the image, the camera tries to refocus, delaying the image. When the autofocus button and shutter button are one and the same the camera may not take the photo at the precise moment the shutter button is pressed.Īt times, when the photographer wants to take a large number of photos, quickly, in sequence, as often happens in wildlife or nature photography, the camera may not take the image. Problem 2: Delay in High-Speed Continuous Shooting The results are sharp focus and the correct exposure settings, consistently.Ĭaptured using back button focus & a tripod to ensure sharp focus. The shutter button takes the image, nothing more, nothing less. None of these problems exist using back button focus.Īfter selecting the correct focal point, using the back button, the photographer selects the exposure settings & presses the shutter button. Since the camera was guessing at the new settings, without the photographer’s final review, the image was out of focus with the incorrect focal point and exposure. Without the photographer being able to review these newly selected settings, the camera captures the image. When pressing the shutter button, the camera tries to refocus and meter the amount of light in the scene.Īlthough both tasks have already been accomplished by the photographer, the camera has no way of knowing this. Using the shutter button to focus often produces the incorrect focal point, exposure/image brightness, and shutter speed, rending the image useless.Īfter selecting the correct settings, f-stop, shutter speed, ISO, and focus, the photographer reviews the image, prior to pressing the shutter button. Problem 1: Unwanted Change in Focal Point, Exposure Settings & Metering These are the main reasons to start using back button focus.
Here are some of the problems produced by having the autofocus button assigned to the shutter button. When the photographer wants to capture an image, they press the shutter button.īack button focus was used to capture this shot, handheld, on an 8-day mountain expedition. When the photographer wants to focus, they press the back button. Photographer has complete control over the camera & lens.The camera never guesses what the photographer wants.Photographer has complete control over exposure triangle settings prior to taking the image.Photographer has complete control over metering prior to taking the image.Photographer has complete control of focal point location and focus prior to taking the image.Each is described in more detail lower on this page. Here are the main benefits of back button focus. This way the camera never has to guess why you’re pushing a specific button. Now, the photographer can control focus with a single button and take the image with a single button.Įach important camera setting should be controlled by a single button, no more. Moving the autofocus button to the back of the camera removes this guesswork giving the photographer complete control & sharper images on a consistent basis. The camera’s guess is often incorrect leading to out-of-focus images & incorrect settings. When the autofocus button and the shutter button are one and the same, the camera has to guess between two choices. Out of the box, cameras control autofocus using the shutter button, which also takes the image.
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