لكل سؤال جواب .. مجلة فن التصوير اللبنانية _ ع٥٠

Every question has an answer

Information about 9000 -Minolta and Nimslow and Kodak films

1 - I read the information published in previous issues of “The Art of Photography” about the camera (MINOLTA 9000) - I was impressed with the high technology and the amazing features of this camera and its accessories and I wanted to buy it from abroad.
However, some things that I did not touch on the art of photography stopped me to talk about clearly, or perhaps I could not fully understand them, which are:
A: Can the Minolta 9000 stabilize film in order to make multiple exposures on one frame or slide?
B - Is there a remote control device separate from the camera to control it, and enable us to perform all the operations necessary for photography, ending with the release of the shutter?
A - Since this camera works according to a precise computer program.
What are the faults that may occur and is it possible to fix it in the Middle East?
2- What is the address of the company, Nimes Low, that produces third-dimensional cameras that show and print their films? .
3- There are many sources of Kodak film production. Is there a difference in quality between one industry and another?

Ahmed Tutanji
Aleppo, Syria

A - This camera includes a program for multiple imaging, which is easy to use and is located under the film winding arm.
B - There is no such part available until now from Minolta.
A - Until now, we have not received any reports about this camera, knowing that it needs time before passing judgment on it, but it is really admired by all photographers.

2- We published in Issue No. 48 the address of this company.
3 - There is no difference in the quality and the place of manufacture, as Kodak is subject to constant monitoring by the International Standards Company, which verifies the sensitivity of the films and the quality of the materials used ⏹

⏺ books for negatives

Gentlemen family art photography.
I request assistance in obtaining books on the science of negatives, negatives, or on printing and development, and please mention the name, and I will sponsor it.

Ibrahim Al-Aaser
Homs - P.O. Box 1003, Syria.

There is a series on film endorsement and printing and its arts under the name (Peterson). There is also a series (Time Lifr), which is a complete encyclopedia of all subjects. If you are interested in laboratory arts, there is a shop specialized in this art called (Dark Room photography).
And its address: 56629 P.O Box Boulder, Co 80322 6629 U.S.A⏹

⏺ Clarifications on microscopic imaging

After you answered my questions in issues 25, 31 and 32 about microscopy, I photographed using black and white films and slides, and I used a microscope equipped with a fixed camera (Oppton). After filming, the result is as follows:
1- The photography was acceptable and clear with normal black and white and color films.
2- As for the slide films, they were very bad and did not show any image. What is the reason? Is it due to artificial lighting or not using a filter?
3- What is the preferred method for photographing the bacterial culture dishes completely, and photographing the colonies individually, on the condition that the details of the colonies appear, bearing in mind that I use a (TTL) camera with a lens attachment, in order to reduce the distance between the dish in which the colonies are to be photographed. Is it preferable to use electric lighting or external natural lighting, as well as the background and the color of the surface under the dish? 4- Is it possible to photograph and there are auxiliary tools to clarify the details of the colonies, such as using a magnifying glass?

Muhammad Al-Ghussain
Damascus, Syria -

1 - In black and white, I got a good result, noting that you overexposed, that is, your films came standing and this means that the subject got the amount of excess light, so reduce the amount of light, close the aperture, or raise the shutter speed by one degree.
2- Since you photographed the same subject with the same devices, it is clear that you were not able to know the amount of light, and this means that the slide films that were exposed to excess light will be completely white, because they are positive films. Unlike negative films.
But if it is not exposed to sufficient light, it will turn black, bearing in mind that you did not tell us about the type of film you used and the type of lighting.
In any case, these ijtihadi issues remain limited to continuous experimentation and improvement until we get tangible results.
If you use electronic lighting (flash), you must use (Daylight) films. If you use the available internal lighting, then it is required to use (Tungsten) films.
3 - For photographing bacterial plates, it is preferable to use medium-sized cameras - 6 x 6 cm - to obtain greater detail and accuracy of vision. With your camera, this task can be somewhat done with the adoption of electronic lighting, bouncing and dispersing flashes - umbrellas - for this please review Issue No. 35 and watch Optical models and routing style.
For the background and the floor, it is preferable to be dark to get the details.
4-It is preferable to use a close-up lens to obtain complete and accurate details ⏹

⏺ Information about Kodak Special Movies

I have received from outside the Kingdom three types of special films, the expiry date of which is in the month of 1987. Therefore, please give me a simple explanation of the functions of these three films, as soon as possible, so that I can use them before the expiration date, bearing in mind that I placed them in a refrigerator with a temperature of about 8 degrees Celsius. : since you received it; 24 hours before shooting, I will take it out of the fridge.
The names of the films are:
1- Technical Pan Film 2415
2 - film 2481 High Speed ​​Infrared
3- Recording Film 2475 .

Ishaq Hassan Qari
Riyadh - P.O. Box 11416
Kingdom of Saudi Arabia .

. Technical al pan Film (Estor-AH) manufactured by Kodak is a “black and white negative” film with extensive red panchromatic sensitivity and characterized by very fine stippling and extremely high dissolution energy. It is a film that replaces two films used in a wide range of scientific and technical applications: Solar Flare Patrol Film 392-50 and Monochrome photomicrographic film.
( Photomicrography Monochrome Film 50-410 )
They are characterized by multiple advantages that are not available in films (410-50) and (293-50). These advantages include greater sensitivity to green, energy
Greater decay, modulation transfer « MTF Function » and better handling of chip structures.
The sensitive layer in the technical pan accepts acidification elastically over a wide range of optical contrasts. It is a contrast control that is particularly useful, for example, in photographic microscopy of low-contrast samples.
As for the gelatinous - pigmented back layer, it prevents evaporation as well as light transmission. As for the (Estar-AH) layer with a base density of 0.1, it allows you to deal with the film that is installed in a booth under reduced light.

Its applications:
This film works to improve the photocontrast in microscopic photographic samples that are colorless, or that are faintly colored, or intended for periodic light contrast (phase) or Nomarski illumination, such as studies of chromosomes in the cell or the sum of the characteristics of its nucleus. It needs reduced exposure times with green filtering in microscopy photography.

It is in the solar register. It replaces the Solar Flare Patrol film of a solar recording on a disk and gives information about solar phenomena that occur in all green positive wavelengths.

It may also be used to record the output of 640 to 660 (mm) peak LEDS and plasma displays.
This, and since it can give a very large light contrast and maximum intensity when developed in selected traditional appearances, this film becomes very useful for making black and white slides.

It is a high-speed, high-contrast, somewhat infrared-sensitive film used to cut through haze in landscape photography and for special effects in architectural and commercial photography. This, with diameter changes to the endorsement and the use of different filters. The film has applications in scientific, medical and recording photography, as well as in photomechanical works and microscopic photography.
No safety light at all.
And you have to deal with the film and develop it in total darkness.
There is no way to give accurate numbers about the speed of the infrared film «infrared», because the rate of this infrared radiation in the light is variable and most of the exposure meters reflect light alone, and since the light levels that appear to be similar may be very different in terms of what they contain of infrared rays. red The correct exposure will have to be determined by trial exposures taken under the conditions under which the pictures will be taken .
A filter should be used on the camera lens - or on the light source - to absorb the blue light that the film senses. For general photography, a Kodak Wratten Filter No. 25, or equivalent, is recommended.
Infrared rays in the flat lenses do not focus the same as visible rays. From here, you have to narrow the aperture to as small as the circumstances allow, and if it is necessary to use wide apertures for the lens and the lens does not have a focus signal for the infrared, you have to reach a correction by conducting a practical photographic test.

The following numbers apply to the indicated clear flash lights when a Kodak Ryton filter number 25, 29, 70 or 89 (B) is used on the camera lens.

⏺ contrast in the picture

I read in a book that deals with photography about the contrast in the image and that there are factors that affect the degree of contrast, so what are these factors?

Your friend Salem Saeed Break
Jeddah-Saudi Arabia

The degree of contrast in the image is due first to the climate, ie the small dust scattered in the atmosphere.
Secondly, to use long lenses.
Third - and most importantly - the excess or incomplete photoexpression ⏹