Sheet turns over the camera product such as small sheet to had gained ground very much nowadays, but even if is such you have had encountered obviously the eye looks quite normal picture, but the photograph or that pats is too bright or too dark circumstance, perhaps take a picture to be opposite from time to tome obviously again on anxious, but why is the photograph still empty it seems that, ? Actually, this does not give an issue on behalf of your camera, however you need to know a few little skill that be used about camera and take a picture.
Above all what we need to understand now is what is called " Bai Jia is black decrease " . When take a picture actually this is use camera a kind of mode of operation in taking a picture, simple for film whole slants namely bright (white) exposure should increase when setting or object, film whole slants dark (black) exposure should be reduced when setting or object, the purpose is to amend camera to measure smooth deviation, let a photograph obtain an appropriate exposure parameter according to our idea, get the picture with a piece of normal exposure.
Exposure, what is be to measure light?
Exposure, it is to show the sensor inside camera receives outside light, fashion the process of the picture again. But outside light cannot accuse sometimes, if camera receives radial inadequacy, the photograph is met too dark, be called underexposure at that time; If receive the light too much, the picture is too bright, this kind of circumstance is called overexposure.
What position of casing of the yellow in the graph shows is camera exposure value, meet exposure toward picture of 0 left attune pale, meet exposure toward picture of 0 right attune brighten.
Measure light, come from literal say, "Measure " as a verb, so measuring light is course of a start. Right, measuring light is plan the light and shade that measures the light, the process of correct exposure comes true when making camera takes a picture, there is an evaluation to measure commonly in camera smooth, local measure light and dot to measure light, the watch for an opportunity that has professional mode function basically supports these 3 kinds of pattern that measure light.
Why should add in vain black decrease?
Most when film person can think dark moment increases exposure with respect to this, too bright reduce exposure with respect to this, but when using a mobile phone to take a picture occasionally not applicable, had filmed according to filming the reflex of the object is judged because of the system measuring light of camera environment, can self-adjusting light exposure. For instance dark when picture of judgement of the system that measure light is too dismal already self-adjusting exposure lets picture light, if he increases exposure again, the picture is met only character brighter expose to the sun too even. Undertake measuring light to white object, photograph opportunity thinks the object is too bright let a picture automatically pale, so need increases exposure (Bai Jia) , undertake measuring light instead to black sheet, photograph opportunity thinks the place that measure light is too dark automatic brighten, so need reduces exposure (black decrease) .
Pat Xue Jingshi to be able to be experienced in the winter actually, if use camera to film automatically only, so gotten picture can be compared commonly dim, when because this is camera,measuring light namely, think white thing is too much so oneself reduced light exposure. So the snow that this moment needs to increase exposure compensation to make a photograph medium restores it originally white. And filming when the close-up of object of a few black, camera thinks spot light inadequacy can increase light exposure, you want the object of filmed black originally, the likelihood exposes to the sun too grizzled, this moment reduces exposure to let an object present original color with respect to need.
Film Xue Jing needs to add exposure to come the brightness with reductive actual setting
Exposure is decreased to be able to take very significant silhouette effect below the setting sun
Anyhow, "Bai Jia is black decrease " it is to make up for the limitation that light measures when camera takes a picture namely, undertake intervention with artificial means, the exposure that gets we want is worth.
The safe shutter of camera is very important also
To a piece of photograph, evaluating the requirement nature with its elementary stand or fall is to be patted namely clear. Fall in type of hand movable mould (opportunity of automatic mode photograph adjusts shutter rate according to exposure proper motion) if want to hold,film the picture that gives a piece of clarity, the simplest method raises shutter rate namely, but if shutter is too fast, film the photograph that come out can appear again likely the circumstance of underexposure. Be in early so the film times 30 years ago, cameraman people had to give " the slowest shutter that holds camera to assure clear picture is worth " academic, namely what we say today " safe shutter " .
Before cameraman films cannot be examined immediately after the photograph, the result with final photograph also can be in only after rinsing, ability knows, if the photograph films blur or the word of underexposure undertakes very hard remedy or retake, be in so at that time " safe shutter " appear very was necessary. And come to digital age nowadays, camera nature is more and more advanced, but do not be absent nowadays on behalf of safe shutter benefit from, although all sorts of camera lens optics are prevented now,tremble and camera sensor is prevented shake a technology to emerge in endlessly, also be resume is in nevertheless " safe shutter " go up made compensation.
So after all the shutter speed of how many is " safe shutter " ? A bit simpler for, safe shutter is defined even if ︰ shutter value is not slow at 1/ current scene focal length. What for instance you use is the scene that full frame camera mixes 50mm, the shutter value of so safe shutter is 1/50s; What you use is full frame camera mixes 24-105mm scene, so be in when camera lens the widest end the safe shutter when 24mm is 1/24s, conversely safe when 70mm is carried shutter became 1/100s, so " safe shutter " not be a fixed numerical value, however according to camera lens anxious paragraph differ and change.
Additional, of need is, the numerical value of safe shutter is to build what go up in focal length of 35mm full frame, if you use the watch for an opportunity that is APS-C picture or M4/3 system, so the focal length conversion that still requires a place collocation camera lens is different the equivalent focal length of sensor dimension. Be like beautiful can camera lens of 50mm of collocation of APS-C picture camera, need × of 1.6 " focal length commutation coefficient " , so the camera lens of 50mm is in beautiful can the equivalent focal length above APS-C picture camera is 80mm, accordingly safe shutter is 1/80s actually, and be not 1/50s; The word of M4/3 system camera needs × 2.
Anyhow wants to use the watch for an opportunity in ace, may smooth window is insufficient still, but make sure picture exposure is mixed normally clarity is to take the demand with good the mainest picture, also be him understanding begins of camera. If you return favorite without camera, might as well there taking the advantage of each are big during 618 sales promotion now electric commodity card has activity of very big favourable sales promotion, often choose an equal watch for an opportunity.
