DSLR live view related clear meaning to ask again, some people in the province say I am ignorant .

First of all, live view is almost useless in low light, the screen is completely black, you can try it out for yourself.

It is mainly used for manual focusing when focusing accuracy is required at a wide aperture.

Real-time camera photography really doesn't work. Now Canon Nikon's live view technology is not as good as Olympus'. My first DSLR was an Olympus, and I only used it when I was shooting on the ground from a low camera position. Shooting night scenes has never been used.

I have never encountered the problem of not being able to see clearly and focusing hard when shooting night scenes. In fact, night scenes are not shot at night. It was taken at sunset, when the lights were on and the sky could still be seen.

When the sky is dark at night, you can't make a good night movie. At this time, there is no need to shoot continuous shooting.

Regarding the aperture of the night scene, the teacher said that it is best to use 11 or more, and try to use 16 or more. to get enough depth of field.

Now there are two kinds of ridiculous professional photographers in the industry: one is the one with a flash, and the other is the one with an LCD screen.

The photographer's eyes are trained, and when he looks at the light, he can accurately judge the best amount, quickly set the aperture shutter value, and can quickly and accurately manually focus and focus.

Can a DSLR zoom in focus? I use the Nikon D700, which doesn't have the features you said. However, manual digital cameras, such as Sony's H-series, do have this function.

But what you said is indeed a problem, the current SLR is basically electronic focus, very stupid and naïve, often out of focus when shooting flowers and plants, very annoying. I miss the old way of focusing on the split. Maybe the people who can really use SLR are masters, and there will be no such small problems :)

All I can say is ......Viewfinder + split image screen, if there is no live view manual focus ......Then it's time for the camera to be repaired.

The split image screen does not perform well in light and darkness, but the night scene is basically OK if the focus is placed at 10 meters, and the ...... who want to shoot night scenes with a wide apertureIt is usually equipped with tools such as infrared rangefinders, so I won't discuss these.

1. Viewfinder shooting: It is projected on the camera"Small windows"Shot.

2. Real-time display shooting: It is to shoot through the LCD screen of the camera.

3. The viewfinder of most cameras cannot be 100% framing, that is, the ** that is shot, the range is larger than what you see.

And the LCD screen framing can be 100% the same.

A digital single-lens reflex camera is a single-lens reflex digital camera, the English abbreviation is SLR (Single Lens Reflex), which is to install a mirror at a 45° angle in front of the film plane, and there are ground glass, pentaprism eyepieces, etc. above the mirror.

The pentaprism reflects the real image light many times to change the optical path, and sends the image to the eyepiece, so that the image seen in the viewing window is always the same as on the film, and the framing range is basically the same as the actual shooting range. The unique design of this prism allows the photographer to observe the image passing through the lens directly from the viewfinder.

Live view, that is, the live view function, can be framed by observing the LCD liquid crystal monitor in the way of electronic viewing, which is convenient for framing from different angles when shooting, making up for the limitations of traditional optical framing. Consumer DC is that after the light passes through the lens, it is directly sensitized on the CCD, and the CCD transmits the signal to the LCD screen for framing.

The principle of SLR is the same as that of previous films, usually CCD CMOS is not photosensitive, and it is only energized when the shutter is pressed, so it cannot be framed with LCD. Nowadays, SLRs that can be viewed by LCD are generally realized by adding an extra photosensitive original. The shooting process of the SLR:

There is a mirror in front of the image sensor (CCD, CMOS), which reflects the light entering the lens into the eyepiece, and the moment the shutter is pressed, the mirror flips over, and the light enters the image sensor, which is recorded, and then it can be displayed on the LCD screen.

In fact, take a look at it to know if it is useful! @

It must be optically viewed, it doesn't matter if there is electronic viewing, what camera you buy, the price, and the positioning are all to consider.

First of all, there is no live view in 40D. Then the live view function of the DSLR is present. It's not very perfect.

Although there are settings that you said you can preview **. But in fact, the advantages are quite obvious from the viewfinder (the scope you said). Because of the difference in focusing.

The viewfinder is the fastest in terms of viewing and framing. Then it goes without saying that power saving is naturally necessary. And also when the sun is strong.

The contents are basically not clear from the LCD on the back of the machine. And SLR. This is the word "reflex" that expresses the meaning of this single shot.

And this reflection is the reflection of the light into the viewfinder.

The real-time view is directly displayed on the LCD with CMOS or CCD, the LCD is an electronic display device, the color and resolution are indeed inferior to the viewfinder frame, but this is not the key, the key is that the focus is not as fast as the viewfinder, when you use the viewfinder to frame the frame, it is the optical viewfinder module, and when you use the real-time view, it is the electronic focus module, and the speed of the current electronic focus module is still far inferior to the optical focus.

At present, most people still use optical viewfinders and the reason is because most of the machines in everyone's hands do not have real-time viewing, in addition, for the current body of the SLR camera, the optical viewfinder is more stable in front of the face, and the live view is more suitable for scenes that cannot be optically framed, such as reporters raising the camera to capture and photograph macro flowers and plants.

However, real-time framing is the direction of development, with the development of image processing technology and the improvement of hardware, electronic focus will completely catch up with or even exceed the speed of optical focusing, when the time comes, I believe that everyone will be more and more accepting of real-time framing, of course, in the time of the long beam, the two will coexist, real-time framing will not completely replace optical framing, small DC has it, in case of no power, the LCD on the back of the machine can not be turned on and take a few emergency photos is still very useful :)

There is a delay in real-time framing, the light is transmitted, the image is on the sensor, the sensor has to convert the data, in order to display it on the screen, and the conversion data will take or the basic time, so sometimes you shoot the person with the pose, you see on the screen that he is still a few meters away from the finish line, but in fact, he can argue that he has already run past the finish line and the eyepiece framing delay is wooden, because the light is directly refracted from the lens eyepiece, so well, usually the macro is shot with real-time framing, magnification can know that the focus is not accurate, but the shooting movement, or use eyepieces.

I guess what you want to describe is the fault of the liquid crystal screen (LCD) on the back of the digital camera that does not light up. There are several possibilities for this scenario:

1. SLR cameras usually use a monocular viewfinder for framing, in order to save power, the LCD on the back is not lit, but it will light up after taking a piece and play back the ** that just shot (it will be extinguished after a few seconds), which is normal. The LCD lights up only when Live View (LV) is selected.

2. Some small telephoto digital cameras with a DSLR appearance may have a monocular electronic viewfinder, and some have a selector switch, and the LCD behind the camera is not lit when selecting the monocular viewfinder framing mode (so as not to consume electricity). Some models have a face proximity sensor window next to the monocular electronic viewfinder, which activates the monocular electronic viewfinder framing mode when a face is detected, otherwise the LCD viewfinder mode is activated. If the sensor window is blocked, the camera will mistakenly think that the face is close to the monocular viewfinder, and the LCD will not light up.

3. If the digital card machine without a monocular viewfinder does not light up after turning on, it must be a failure.