Cannot take Photos using the LCD

I just bought a D60 and when I try to take a picture using the LCD screen and auto focus it won't take the picture.  It will however, when I get out of auto focus or when I use the viewfinder.  But not using the LCD and AV screen on.

Everyone knows about this problem?  If so, how to solve it?

I assume you mean that the 60 d (he was in fact a D60, but it is more than 10 years.)

Development of systems should has enough light and (b) an object with a certain contrast.

For example: she would have a hard time focusing on a wall of ordinary color in dim light.  But if you give him something with contrast, going to an easier time concentrating.

What kind of lighting you have and what kind of subject you want to photograph?

Have you tried to test the system under ideal circumstances (beautiful light bright and contrasting topics?)

Either way... using the camera through the viewfinder will still be faster to use liveview.  The camera actually uses different systems development depending on how you use it.

When you use the viewfinder, autofocus camera sensors use "phase detection".  These sensors are not on the image sensor.   The reflex mirror bounces low light these sensors.  The sensors are looking for contrasting edges.  Through a Prism-like efect, part of the image moves in one direction and in the other part (imagine use a pair of scissors to cut a picture into two halves and then slightly evil align the image along the cut).  The amount of the displacement varies according to the distance of focus on the subject.   The camera is capable of analyzing the pixels along the edge to determine how the two halves should adjust, and with this, it can determine how the focus needs to be adjusted in order to bring together the image.

There is an additional advantage to the phase system to detect.  The system is able to analyze all areas of focus at the same time.  The direction of movement tells the camera that he needs to focus closer or further away.  That means in a moment, the camaera knows _which _ AF point is on the nearest subject and he knows how and to what extent the development must settle before the picture comes to focus.  That means the phase detect AF systems is generally useless to "hunt" for focus... they know exactly which way to turn the update and how far to go to get a lock.

The phase detection system is very fast.

When the camera using the "live view" mode, the reflex mirror was swinging clear so that the light can strike the image sensor.  This means the tiny mirrors that bounce light in the development of phase-detect sensors are not in-game camera cannot use this system.

Instead, it analyzes the image on the sensor trying to achieve maximum contrast in the target areas.

The best example I can think of is to imagine a "UPC code" (bar code) and imagine what it looks like when it is 'in' focus 'out' of focus vs.  If it is, in short, you have a white background with rows of sharp, crisp, black.  But if you think that involved... colors each pixel is 'white' (background) or 'black' (scratches).  There is no pixel 'gray '.    Now, imagine this same barcode horribly blurred... you have a white background, but when you approach a black line, go you through a lot of "grey" get pixels gradually darker until you get to the black parts of the streak.   The camera knows that he emphasized when she reached the highest possible contrast between adjacent pixels.

Unlike the "detection phase" development, the system of 'contrast' doesn't know what direction to adjust to get the update.  It samples should be taken... (adjust and see if it is better or worse... If it gets worse, reverse the sense of the update and try again).  Not only the computer did not have to do further analysis to detect if the image is sharp... He must do more iterations because of the problem of hunting of accent.

Point & shoot cameras and 'live view' mode on cameras digital SLRS generally use this system of the development of "contrast detection.  The system is extremely accurate... but the drawback is that the computer has to analyze the image for contrast several times and it's not nearly as fast as the phase detect sensors (which are usually extremely fast).

Cameras struggle to concentrate when there are nothing to do with contrast high to base its analysis.  They struggle in low light because there is not much difference between the dark and light areas.

Canon has a new system called the "double pixel" AF.  They essentially combined the "phase detection" technology right on the sensor by creating micro-prismes on the surface of the imaging sensor itself.  The camera is actually capable of doing the "phase detection" style auto-focus directly on the surface of the sensor (never possible and Canon are the only company that got it.)

The new 70 d is the first DSLR (and currently only) to get the system.

If shoot you, you don't have the choice... the mirror must be upward in order to record videos so the camera can only use by contrast detection focus when shooting video *-with the exception of the D 70 because he can actually do "phase detection" focus directly on the sensor.

Tags: Canon Camera

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