Photograph and expose and compensate EV to adjust
Diaphragm and shutter are all controlled and exposed on physics, but EV in the digital camera can control more rational exposure by adjusting the software within the camera! Should mediate and pay attention to knowing the help cameraman that EV can be better gets and exposes the more accurate photograph.
A lot of players often only notice one time of rates of optical zoom of the digital camera when selecting the digital camera, questions such as picture element, the size of resolution ratio,etc., it is often not enough to expose attention of the parameter as to the digital camera, and this certain digital camera shoots a very important link in course.
Can refer to EV to expose to talk about - -Exposing value. The exposing value relates to diaphragm, shutter and ISO sense rate, when ISO is fixed, EV is diaphragm and particular association of shutter.
We tell the concept of EV through the way that a diaphragm shutter express correspondingly.
Start from scratch and learn to photograph easily Expose and compensate EV to adjust
Delegation array A of the diaphragms, from f/1- f/32, but on the left is the pace of a shutter, the unit is second, from one second to 1/1000 seconds. We are with EV =6 example, find out any 6 in form, see it competent tabulating number value that corresponding to separately, such as 8th line of 4th being 6 for one, then its corresponding diaphragm array is F1.4, the shutter speed is 1/30 seconds.
This form is very simple, everybody should understand soon, but diaphragm ranges of one yard of cameras of ordinary consumption progression are mostly between f/2.8- f/8.
Play with people of digital camera know, have, expose, compensate statement this, expose, pay for, divide into, compensate and shoulder, pay for two kinds straightly. It compensate it is promptly cost meaning not increase exposure, it label to EV +; Shoulder and compensate the meaning that the exposure should be reduced promptly, label it for EV-. And can find out, EV0 is one second, association of f/1, EV20 is 1/1000 seconds, association of f/32, it is obvious the exposure maximum is EV0 from the form, the minimum is EV20. This, and digital camera compensate, expression compensated to shoulder way just the opposite, that is to say that +, in fact EV value should being reduced to compensate EV; And shoulder and compensate EV -, EV value should increase.
The above slice increases by 0.3 slice strucks for EV
This piece, increase 0.70 block for EV, according to two the same picture of scene, we can see different EV bring I door different to expose making up, can make the cameraman give play to one's own most abundant imagination to play with the light!
Digital camera mode of exposing
The present digital camera is exposed the mode and generally divided into two kinds: Form automatic mode and all manual mode ' The preferential mode of the diaphragm, preferential mode of shutter) .
The preferential mode of the diaphragm means that the persons who shoot choose the diaphragm size while shooting artificially. Choose by camera suitable to expose required shutter time expose the mode automatically automatically according to information, luminance of scenery and sensitivity and diaphragm that choose artificially,etc. of CCD, automatic way of exposing of manual, shutter time that it is the diaphragm too. This kind of way of exposing is mainly used in and needed to pay the utmost attention to the shooting occasion of depth of field, photograph etc. such as shooting the scenery, portrait or little distance. Its advantage can let the persons who shoot control the depth of field according to the demand.
The preferential mode of the shutter speed refers to on the basis that the persons who shoot determine the shutter, by the camera according to examining all information, CCD sensitivity and shutter time to set for artificially, select and expose the diaphragm size needed correctly automatically. I.e. shutter time is chosen manually, the diaphragm is set automatically. Under this mode, no matter most cameras choose the time of shutter manually, the camera sets diaphragm coefficient automatically, will reveal on LCD screen and in the view-finder.
Manual to shoot and need the manual regulation of finishing the diaphragm and shutter speed under exposing the mode, it's a pity, have function this digital camera little, but exposure of digital camera compensate function may satisfied with the user for expose demand that is change to a certain extent. Can make value degree of the photograph change to expose the digital camera compensated.
May take the good result under most light by mode of exposing automatically, but to be strict, the establishment that is exposed automatically can all be by finishing exposing and controlling perfectly under any light condition, it has some one's own defects too, because the s struck are under different environmental light, seem essential that so how to control exposing correctly. Flashing lamp, reflect light board,etc. to be naturally very useful, correct to use, expose, it compensates to be best to compensate to defect this, enable camera to take the high-quality picture. Commercial digital camera offer, expose, compensate function, regulate range generally until ¡À 2.0EV about (general exposure of digital camera step of person who compensate 1/3EV generally now, some are 1/2EV) . Some better digital cameras are also exposed and surrounded shooting(AEB) automatically The function, that is to say under the circumstances that the step that is exposed and compensated automatically that users establish is long, shoot 3- 5 photos continuously, let users select the result to be most close to the coming of the material from it, but there is a question, it is that a flashing lamp is unable to use while opening AEB function. .
Make what kind of adjustment decide by cameraman, one point confirmed exposing, that is " Should strengthen, compensate, when should reduce compensation " . Choose what kind of luminance to come, know by eyes of cameraman finally, but there are certain principles: Generally speaking, white and high light and many target, should increase and compensate; The black and dim wide target of area, should reduce compensation.
Don't confine to photograph to the quality of the machine frequently, certainly the specialized persons who can help to shoot even more of camera realize more shooting ideas, diaphragm, the shutter, EV, the lens,etc. are all that a DC is basically fixed, so after understanding the technology, the most important one trains one's own aesthetic conceptions and cultivation of a eyes alone! It is foolish not to know me and see whether everybody admit " The original eyes are better than the specialized lens " .
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