Tlr الكاميرا ثنائية العدسة ميزات ونتائج عالية .. مجلة فن التصوير اللبنانية _ ع١٤

TLR dual lens camera features and high results

What is the difference between a single-lens camera and a dual-lens camera? Note that the first is the most common, but it is not the best in practice... Since the (SLR) camera has always taken the largest part of the definition, we must here shed light on the (TLR) camera with its pros and cons..

It is true that the single-lens reflex camera (*) (SLR) is the most popular among photographers, based on the ease of handling it, but those who want to improve their photographic results can turn to the two-lens reflex camera (TLR), which is superior to the single-lens camera with many advantages and few disadvantages.
The dual-lens camera (*), as is clear from its name, has two lenses mounted on a moving plate, one on top of the other. The upper lens is used just for viewing the subject, so it is called the viewing lens, while the lower lens acts as the only SLR camera lens, as it assumes the task of focusing the image on the film and works to control the expression of the aperture, but it includes in addition to that the shutter mechanism and it is called the capture lens.
The upper and lower lenses in a TLR camera have the same focal length and are paired mechanically, as the two lenses move together when turning the focus knob to become together in or out of focus.

We are now reviewing the benefits or merits of the TLR camera, on top of which is the separate viewing system that reflects the image on the viewfinder screen by means of a special mirror. Vibrations, and this is what also avoids drawing the attention of the subject, as the shutter is also silent and almost silent. This matter can be exploited during filming plays or some types of sports matches in which the sound - the sound of the shutter - is unfamiliar, and arouses the curiosity or annoyance of others, which prevents obtaining snapshots before arousing the attention of others. In addition to that, the traditional camera location at the waist - instead of the exciting location on the face for the (SLR) camera - is less confusing for the subject that you seek to photograph in a direct formal session, where the relationship with him here is face to face, which contributes to giving spontaneity to his movements, as well as helping to Cancellation of the traditional formula of people who hold their breath and freeze their expressions waiting for the shutter sound on a single lens camera (SLR).

the film
The TLR film roll is also distinguished from the well-known 35 mm (SLR) films. Here it comes in the form of a roll without holes and with a length of 12 or 24 frames. The first is known as 120 frames - 120 film, while the second language - 24 frames - is called film. 220 0

In order to protect the negative here from light, the film is composed of two negative layers and above it is an opaque background bearing frame numbers for use in cameras that are not equipped with automatic winding systems.

When endorsing the language of the film, it is necessary to remove the paper background attached to the negative, usually with adhesive tape, and here one must beware of confusing the film with the background paper. This matter has been exposed to by many technicians who discovered inside the black rooms that they are working on endorsing the background after they threw the negative in the basket Trash. It must be noted that the endorsement period for these films differs from the period followed in the endorsement of 35 mm films. Thus, attention must be paid to the instructions of the producing company on this subject.. The issue of developing is normal and does not differ from one film to another. An enlarger whose lens exceeds the lens used to print 35 mm films, and it is known that these films require a 50 mm lens, while the (TLR) 120 or 220 film needs a 75 mm lens. The advantage of this roll of film is also the square construction of one shot - + 2 inches » by 2 inches
- It is approximately three times the size of a 35 mm film shot, and this helps in obtaining better quality enlargements in terms of the softness of the stippling. From this point of view, we find photographers of the architectural field and still life consider shooting with a TLR camera and its coils as an ideal work. This also allows us to print clips Most importantly for a single shot, where a large negative allows for greater freedom in editing,
Unwanted parts of the image, without affecting the quality of the final print. On this basis, we find those wishing to conduct numerous experiments resort to these cameras with their films because they are aware in advance of the possibility of editing and sleeping comfortably in their negatives before printing.

The advantages of a specific viewfinder

In a TLR camera, it transmits to us the image of the subject with the same size on the negative. This makes it possible to see the snapshot as it will be in its final form, which helps in a correct reading of the light, in addition to a clearer reading of the light, as there is no barrier here that controls the amount of light, which keeps the image bright and clear despite the decrease in the stop of the capture lens (F). We will not forget that it is among the advantages This camera, also in the viewfinder field, is the top-down vision system. This goes beyond seeing the image vertically from a place close to the eye and allows for horizontal vision.
It increases the ease of evaluating the scene and allows for more accuracy and attention to the content, especially with the presence of the large and bright viewing screen.

In the case of taking pictures from a low point of view, photographers with a (SLR) camera realize how much inconvenience they encounter... This will never happen with a (TLR) camera, where young children can be photographed from the level of their presence, as well as taking some dramatic shots of cars, for example, or other objects. Topics that usually exist at low levels, all these things are done easily,
And without having to sit at ground level or even lie down, a TLR camera is preferred, which allows for a good view from low levels...