Big aperture camera in after effects how to#

A small focus distance between your subject and your camera.A large aperture of the diaphragm of your lens.What you need to remember is that a background blur is favored by 5 shooting parameters:

Big aperture camera in after effects how to#

You do not know what depth of field is? You do not know the theory of emotions, nor the emotional effects of this technique of shooting? Read first my article:ĭepth of Field and Your Emotions: Why Soft and Sharp Focus Reinforce Your Photo How to Get a Background Blur With Your CameraĪ background blur is a physical consequence of the laws of optics with a shallow depth of field (I will spare you the mathematical formulas!).

The 5 shooting parameters to have an in-focus background.The recent ability of high-end smartphones to blur a background.The 5 shooting parameters to have a background blur.This will require some investment in good camera equipment, both for body camera and lens, as well as good shooting techniques. But getting a blurred background is not so simple: you need to master the depth of field. In practical application, a so-called hyper-focal setting on a lens, may give an acceptable image of a scene when viewed on a small format display or print, but when expended or enlarged, will yield a more fuzzy appearance as it is in reality not completely in focus through the 'depth of field.A beautiful background blur is a particularly desirable effect for portrait photos. So acceptable depth of field is a determination of the effect of the impact of an off focused image on the observer, given the optical system (atmospherics, lens, sensor/film, and rendering/printing process) and the perception perspective (how big is the viewed image). Think of it this way: a thumbnail photo might look clear, but if expanded to be an 8x10' photo, it may be unacceptably fuzzy. So what really happens with depth of field is that objects are not really in focus off the focused plane, but rather the blur is considered negligible. Unfortunately, depth of field has it limits, and a very very small aperture will not provide nearly infinite depth of field, because diffraction plays a greater role, in blurring the image, as the aperture gets smaller. So the perception of the depth of field is linear with the f-stop and focal length. The resultant image is one which is the convolution of the target image and the point spread function. The point spread function of an optics system is also called the impulse response. This helps reduce the point spread function which describes the circle of confusion (and not always a circle). Smaller apertures employing central portions of the lens, have the light taking a shorter (and more consistent) path through the lens. At that point the imaging system performs in accordance with losses such as atmospherics and the MTF (modulation transfer function) of the lens.Īs an object moves off that plane, it immediately becomes 'out of focus' and there is a point spread function which describes a growing disk which is in some circles (no pun intended) called the 'circle of confusion.' It is really a game of 'how much blur can we have until it becomes objectionable?' There is only one 'plane' (usually really a segment of a sphere) which is in focus. Depth of field is a perception phenomenon which factors in the HVS (human visual system).