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Allow Latitude movies

Exposure errors, by which we mean the ability of the film to be overlooked. We find that any film under certain light conditions gives the best colors or the best shades of gray if the ideal exposure is taken. But the film within certain limits can give an acceptable picture if the exposure is less or more than the ideal exposure. We find that the reproductive colored films that produce optical strips have very little tolerance, for example, less exposure has more aperture. hole and a half. They are followed by colored negative films, and the most acceptable ones are black and white negative films, which accept less exposure up to 2 iris holes and more exposure up to 3 iris holes. pupil and even exposure

How do you choose the right movie? In order to know the best film for you, the following matters must be researched: (a) the size or scale of the film:

It goes without saying that the scale of the film must fit the camera. But here I want to help the photographer who wants to buy a new camera or who owns a camera that has the ability to use adapters for different sizes of films. Therefore, we will be exposed to the advantages and disadvantages of different sizes:

110-inch film and disc film: These two films are very small in size and are only suitable (in my opinion) for beginners. Film 110 is sold packed in a cartridge of 24 images, and sometimes 12 images. The cartridge is placed in the camera, and at the end of filming, the cartridge is removed and sent. As for the disc film, it is contained in a special plastic cover. When filming is finished, its cover is removed and sent for development. These two films adjust the speed of the film on the camera automatically. for acidification. Secret
, which is a 35 film size: this is the most widely used film size, and the smallest size a serious amateur or professional can use. Through it, it is possible to reach an enlargement of up to 50x40 cm using a small-grained type. This size is characterized by the fact that all kinds of films are represented in it, especially Coda Chrome films for colored slides, which are preferred by many amateurs and professionals. There are also types of infrared films that do not exist in other than this scale. The film is sold in this size in a cassette with a capacity of 12, 24 or 36 images, and it needs to be rewound in the cassette before removing it from the camera.

Kodak has begun to number these cassettes magnetically so that the speed of the film is set automatically on the cameras equipped for that. The area of ​​this film is 24 by 36 mm. There are some types of cameras that use only half of this space to give 72 images in the film, and they are called half-frame cameras.

120 or 220 roll film: This film is wound on a reel with an opaque paper backing. During filming, it moves to another reel in the camera, and after filming is finished, it completes its winding on the second reel and is attached to the tape on the back of the paper. Film 120 contains 15 photos measuring 4.5 x 6 cm or 12 photos measuring 6 x 6 cm or 10 photos measuring 76 cm. Or 8 photos measuring 6 x 9 cm

As for the 220 film, it contains a larger number of photos, for example 22 photos of 6 x 6 size - and these two films are considered ideal sizes, as this size combines reasonable light weight in the cameras that use it and excellent quality. The disadvantage of this size is that the cameras that use it are expensive
The price is often twice the price of the one that uses size

In fact, if a person saw an image with a projector on the screen of a 66-mm slide and another image of a 35-mm slide, he would realize the huge difference in quality that only those who saw it would believe. Usually, when the amateur progresses in his hobby, he acquires a camera that uses this size of films.

Sheet-form films: There are sizes from 4 x 5 inches to 8 x 10 inches. This size is used in large studio cameras and is used by professionals, especially those who specialize in advertising products, because it gives the summit in clarity, sharpness, gradation, and the ability to enlarge massively.

Films that have disappeared, such as 127, or are on their way to extinction, such as 126. This is an area of ​​about 28 x 28 mm. (b) Speed:

Speed ​​is measured, as we have already mentioned, by ISO.

We want to shoot and choose slow motion movies of 25 or less if we want the best sharpness in the picture, such as when we are working on artwork, manuscripts, etc..

We choose medium-speed films around ISO 100 for general subjects such as nature photography, travel, etc.

And we choose fast films around 400 ISO when shooting in low light, to stabilize movement, or when using telephoto lenses to allow us to use speed

High shutter speed to prevent camera shake
We need high-speed films of more than 1000 ISO in some very special cases, such as filming in the theater without using flash. The disadvantage of the films is the large size of their grains, which appear even in the size of a normal postal card.

(c) Film type:

<-1 The type that requires colored negative films: A colored negative (negative) is given that can be printed and enlarged to obtain a colored paper image. If we want pictures to put in an album or enlarge to hang in a frame on the wall, this is it. There are different speeds of 100, its use, 400, 200

1000 iso. These films are distinguished by the last syllable in their name, color, such as Kodacolor, Fujicolor, Agfacolor, etc. This type is characterized by the ease of obtaining hundreds of copies.

From any color film, colored fleece paper slides or photographs can be obtained

Black and white (in some labs only), but the more steps

The argument whenever the image quality is served. Therefore, he determined the final result

that you want and use the appropriate film for that
Positive color films: These are given colored slides (slides) for use in a projector). The disadvantage of these films is that they only give one reproductive image. And if we want to make other copies, that will be done by means of a special device. Paper prints of these slides can be made either by making an internegative negative or of course directly onto positive sensitive paper. But all these operations are expensive and reduce the colors and splendor of the original chip, which is characterized by wonderful colors that are incomparable to any paper image. This type of film is distinguished by the last chrome clip, such as Kodachrome, Ectachrome, Fujichrome, Agfachrome, etc.

There are three types of this type:

Daylight positive color films: These films are prepared to give good colors with a light temperature of about 6000 K such as standard daylight or electronic flash (see chapter Light). As for when using this type with studio lights or home light, it gives pictures with an orange tinge.

Color positive films for use with studio light: namely

Two types: Type (A) (A) is intended for use with amateur bulbs of a degree

Its color temperature is 3400 Kelvin.

Type B is intended for use with professional bulbs

Its color temperature is 3200 Kelvin.

And if these films are used in daylight or with flash, they are given

The image is a cool blue tinge.