لكل سؤال جواب .. مجلة فن التصوير اللبنانية _ ع٤٨

Every question has an answer

prior knowledge device

I would like to get a comprehensive idea of ​​how to operate the depth-of-field pre-knowledge device, which is located under the lens on the left side of the camera (Canon F - 1).

Maged Abdel Hamid Al-Hamid
Membership number 166
Kuwait

The advance knowledge device allows you to know the result of the final image before capturing, by detecting the depth of field, in terms of light distribution over the scene or the amount of contrast you got for the foreground or background of the scene.
The correct exposure:
You must first make the correct exposure for the scene, then press the pre-view button, as follows:
a - Turn the shutter dial to the desired speed.
B Look at the specific consideration and focus on the subject.
C - Open the tightening slider. by pushing it in and then releasing it; The slide opens like this. Its red line can be seen. The aperture needle will disappear from view while the narrowing slider is extended.
D - Tighten the aperture ring or the shutter disk - until the counter needle becomes aligned with the detection indicator on the pre-calibration.
Choose a slower speed if the meter needle rests below the pointer, or a faster speed if the meter needle rests above the pointer.

2- Shutter priority:
When using the shutter priority, you should apply the following:
a- Place the shutter disk at the position (8).
B - Look at the specific consideration and focus on the subject.
c - Twist the lens aperture ring to the desired aperture.
d - Open the indicator slider.
E - The shutter speed is selected automatically according to the signature of the lens aperture.
- note :
Exposure information will not be displayed with a different selector attached, while the shutter dial is in (B) position.
It is impossible to read the lens aperture when using an (FD) lens with a chrome mounting ring, or when using telephoto tubes or accessories between the lens and the camera body.

3 Detection of depth of field:
There are two ways to detect depth of field.
One is done by using the depth-of-field scale on the lens. It is a scale of pauses/q repeated on each side of the distance indicator.
A - Focus first. Then press the shutter button halfway and see what f/s the counter needle in the viewfinder will indicate. Find the two f/stops that correspond to that number on the depth-of-field scale.
b - Draw two imaginary lines from these two numbers to the distance scale. The effective depth of field lies between these two distances.

4- Depth of field:
You can detect the depth of field visually in the following way:
A - Focus on the topic. Then press the shutter button halfway and see what f/s the counter needle in the viewfinder will indicate.
b Toss the aperture ring to that f/f stop.
C - Press the narrowing slider inwards and then release it so that it opens and you can see its red line. Now, just by looking at your subject through the viewfinder, you can see the fine field of focus.
D - After detecting the depth of field. Push the tightening slide inwards and then release it.
- note :
It is impossible to release the retracting slider while the aperture ring is on (A). If you are using a camera with (AE) shutter priority, you must first move the lens away from (4) and set the working aperture. Then, after detecting the depth of field, return the aperture loop to reference (A).

E - Calibration with a parallel needle:
In order to cross the subject manually, it is sufficient to remove the shutter disc from the position (8). The shutter speed scale will disappear, while a display of the aperture scale and shutter speed will appear to the right of the field of view.
Next, you set the shutter speed and aperture in the normal way, parallel to the meter needles and the aperture in the viewfinder⏹

The three-dimensional camera:

1- Are there international exhibitions other than the Photokina exhibition, and if so, where and when will it be held?
2- I would like to know about 3D images and how different they are from regular images.
3 - I saw in issue 45 pictures of Dr. Baroudi, and I liked them very much, and I would like to know the country in which they were photographed 4 - I went to the general agent for (Canon) products to ask him about the (X4) adapter, and he told me that the company only manufactures (X2) only, so where can it be Obtaining such adapters that are compatible with my camera (80-Canon T70). These wonderful views.
E - I would like to know more information about the (Canon Still Video) camera and the (Nikor2020) camera.

Your friend Mishaal Al-Muhaisen
Kuwait - Jahra

1- There are many exhibitions that are held in Japan, America, London and Greece.. but they are not the size of the Photokina exhibition, nor are they a permanent tradition or specific dates.
2- It is known that the current cameras, as we can see through them, give us only two dimensions.
length and width, but the 3D camera from the company (Nimslo) is based on the principle of recording the third dimension in the image, i.e. the depth, and this special camera uses the same films, but they require special laboratories to be developed, and this is not available except in America. For more information, you can write to the company.

at the following address:
NIMSLO 3D G.A.L. MARKETING (USA) CORP. 331 Madison Avenue NEW
YORK n.Y. 10017. U.S.A.

3 - Dr. Baroudi's landscapes were mostly taken in France, Greece and America.
4- This is the problem of (Canon) company, especially with its two new cameras (-170) and (T80). The manufacture of these cameras is intended for amateurs, and these cameras are usually without sufficient accessories that are available in professional cameras.
E - We will later provide an explanation about these cameras through the section on the world of photography ⏹