How to make good use of lens offset

How to use lens offset? For a photographer, there must be a camera in his hand to record his life. Therefore, it is very distressing for these photographers to have a lens shift. So, do you know how to make good use of lens offset?

How to use the good 1 shift lens to shift the lens?

1. Because you want to use an axis-shifting lens, you must install the lens first. After the axis shifting lens is firmly installed on the fuselage, it is necessary to confirm that the offset and tilt functions are the default settings. In addition, when holding the lens, the tilt angle and offset position should be restored.

2. After the lens is installed, try to use a tripod when taking pictures. Because you need to adjust the direction and angle when using this lens, the effect and operability of having a tripod are completely different.

3. In order to grasp the shape of the subject more closely when shooting, you can select "Grid Line Display" from the real-time setting menu. Set grid lines to facilitate users to accurately control the viewing range. Especially when using a shift lens, this setting will make your shooting more controllable.

4. Adjust the shape of the subject by shifting, and adjust the shape of the subject by manually focusing and shifting. In the shooting process, try to keep the horizontal position relationship between the lens and the subject, and at the same time compensate the shape of the subject.

5. Control the focal plane by adjusting the tilt angle.

Adjust the shape of the object before the tilt operation. In the case of small depth of field, in order to focus the subject as a whole, you can imagine a focal plane. The key to setting this imaginary focal plane is to make the required depth of field as small as possible. In this way, even if the aperture value is small, it is easier to focus on the whole subject. The inclination angle can also effectively prevent the resolution from decreasing due to diffraction caused by too small aperture shrinkage. The picture shows the depth of field and virtual focal plane considered when shooting.

6. Confirm the depth of field, press the preview button of depth of field and adjust the aperture value at the same time, and confirm the depth of field through LCD. At this time, you can't just look at a certain part of the image. You should check all parts of the image one by one and confirm the focus carefully.

Make good use of high angle

Be sure to shoot with the top of your head, but not vertically downward or at a certain angle. The purpose of this is to simulate the perspective of ordinary people watching the model world. If you shoot vertically downward, you can't create a shallow depth of field. So it is very important to find a suitable commanding height to shoot.

Keep the camera as far away from the subject as possible.

Don't get too close to the target you want to shoot. Because the model is very small, in addition to this consideration, we should also consider the depth of field. The effect of shifting the axis is bound to have a shallow depth of field. Photographers certainly don't want our shooting target to be blurred, so stand far away, watch more and highlight the main body of the depth of the scene.

As shown below, the characters in the scene are relatively small and not obvious.

Higher saturation

Quite high saturation is the effect of many photos with axis-shifting effect, and high color saturation makes the picture of photos richer, more beautiful and more fairy tale. Now many digital cameras also have built-in saturation adjustment function. Even if some cameras don't, someone will increase the saturation later.

The high saturation as shown below is that this photo has a fairy tale color.

Be good at using urban themes

Compared with the suburbs, it is easier to find a suitable theme of shifting axis effect when shooting in urban areas. Such as urban roads, airports, urban landmarks, docks, etc. Are very suitable for moving axis photography. Of course, if you want to shoot the suburbs, try to shoot places with cultural traces, such as huts by the river and mountain trails, which can make the picture more model-like.

How to use 2 1 for lens offset, and what is out of focus?

Out-of-focus refers to the phenomenon of focus shift, which will bring a lot of trouble to our shooting.

Take the following scenario as an example:

At that time, the focus I chose was 2, and the actual focus was 1 and 3. You can see that the child's face is empty.

When you shoot with a large aperture or a subject with a shallow depth of field, the' negative effect' caused by defocusing will be more serious. The most typical is the macro theme.

As shown in the figure below, there is a phenomenon that the focus moves backward. Although the deviation is not big, it is enough to ruin the whole photo.

What's more, if the lens is out of focus, it will not be marked on the product information, and you need to test it to get the result-and out of focus is very common, and many people will "win the prize".

Different manufacturers and brands may lose focus, which has nothing to do with the grade of equipment-both high-end and low-end machines may lose focus; Some brands are even dubbed "the king of running coke".

In addition, in the process of lens maintenance, the original internal structure position of the lens may be changed for technical reasons, resulting in serious defocusing. Be careful when handling second-hand lenses.

Lens maintenance is one of the important reasons for defocusing.

In addition to the above situation, there is also the matching problem between the lens and the fuselage-especially when the lens and the fuselage belong to different manufacturers, the phenomenon of out-of-focus will become very common.

2. What should I do if I run out of coke?

It can be said that out-of-focus is a very common phenomenon in the digital age. This problem will only hurt if you don't realize it exists. Once you know how to debug and correct defocus, its negative effects will be completely eliminated, and your lens is still a good lens.

The following are the specific steps to correct the defocused lens:

Print out-of-focus test card

You can buy a professional out-of-focus test card, you can also search for resources online (not as high-definition as you bought, but you can also use it), and you can also make a handy children's shoe according to the instructions of DIY tutorial.

Making test card support plate

You need to find a flat slope of 45 degrees to place the test card. It is very simple to make. Just cut a corner of the carton to make the two right-angled sides equal in length.

Leveling camera

Now most cameras have built-in electronic level meters. Turn on the real scene, and then turn on the electronic level, so as to ensure that the camera is completely horizontal.

If there is no electronic level, an external bubble level can be used to assist leveling.

Keep the height of the camera consistent with the center of the test card.

You need to measure the height of the center of the test card with a tape measure (that is, the length from the ground to the center of the test card), and then measure the height of the center of the camera to ensure that the two are equal.

Determine the nearest focal length

First, observe the nearest focal length marked on the lens.

For example, today we tested Longteng's 35/ 1.4, and its shortest focusing distance is 0.3m, which is 30cm.

Note that this distance does not refer to the distance from the lens to the subject, but to the distance from the photosensitive element to the subject.

Use a tape measure to ensure that the distance between the center of the test card and the photosensitive element is 30 cm, so that the most accurate test results can be obtained.

Start testing

Turn the lens aperture to the maximum and start the test.

Taking the lens in my hand as an example, when shooting in the test card center, the results are as follows:

As you can see, the lens was out of focus and moved back 8 mm.

Adjust calibration

After measuring the defocus, it's time to adjust the calibration.

This time we use Nikon camera, and then take Nikon camera as an example to introduce how to correct out of focus.

You need to find AF fine tuning settings in the camera menu settings:

Open this interface, and you can see that the initial default value is 0. Check the default option.

In the default options, we can see the scale of focus adjustment.

Through the previous test, we know that the focus of this lens has moved back by 8 mm, so we can move the focus forward by 8 mm in this interface, and then save and exit.

Reexamination

After calibration, aim at the center of the test card with the largest aperture according to the method just now, and take another photo to see if it is still out of focus.

If this happens, the focus is only on the scale of 0. Congratulations, your lens is no longer out of focus;

Canon's camera menu adjustment method is the same. You can find the menu settings for autofocus fine tuning, and then follow the prompts.

Finally, I would like to remind you that different lenses are out of focus, some move forward and some move back. It is best to record the parameters of each shot separately. Because, every time you change the lens, you need to readjust the default value of AF fine-tuning to ensure the highest focusing accuracy.