لكل سؤال جواب .. السلايدات والإحتمالات الأربع .. مجلة فن التصوير اللبنانية _ ع٢٤

Every question has an answer

⏺ Slides and the four possibilities

I am a photography hobbyist, and it has been three years since I owned my first camera.
I now have a Minolta X700 with lenses of 28, 50 and 75-100mm zoom. At first I was a fan of developing regular color photos, but then I switched to slide films, so I encountered many errors that I managed to overcome, but there is a new problem that I did not know. I was able to solve it, and it is represented in the following cases:
Usually I use a 25 aza Kodachrome or 64 aza Ectachrome film, after setting the camera and flash according to the aza number of the used film.
25 aza on (P) mode. The lens is 50 mm at aperture 16. Close it at that aperture and use the flash with it set at 25 aperture. I take pictures indoors, but when developing the film, I discover four cases of slide pictures:
The picture is very clear and excellent. Half of the image is clear and the other half is opaque. A dark image whose features can hardly be seen.
The image is completely dark and has no features.
All of this happens during a movie tape of 36 slides, and sometimes the majority of the film's images include the aforementioned cases, and sometimes some images are exposed to different situations, one of which was from the second case and the one immediately after it from the first case, or one from the third case, the other the fourth, and so on.. I thought The reason for this is due to a defect in the camera, and I took it to its authorized agent in Kuwait, and he informed me that the camera is in good condition.
From here, please advise me of the solution, or the source from which I can obtain the solution, noting that this problem does not exist with shooting color films.
I enclose with the letter some forms for your perusal. Thank you very much.

Abdel Hamid Mohammed Al-Nasser
- Kuwait

We start from your last note.
Let's confirm that the camera is really sound as long as its results are with. Negatives . Or as you say, regular tainted films are successful.
The second conclusion is here, and after studying the four cases that I mentioned, and after careful review of . The transparencies sent by you confirm that the matter is related to dialing the speed of the camera, and from here we start processing the request to you to adopt the speed of 60 designated for the flash instead of the pause (p) because this pause is just a process of programming the speeds, from here some pictures look good because the light in them is sufficient for programming While some images appear halftone when the light is too bright, as the programming moves to a speed higher than the speed allocated for flash work, which is 60, as we mentioned.
You should also make sure that the position of pushing or reducing the exposure is at the stop of “0”.


⏺ Moisture on the negatives

I keep the negatives in the bags designated for them and in a place far from influences.
But what happened was that when I returned after a while to print it, the result was blue, noting that it was before normal, and here I am sending you a form to get your opinion, especially since I have some important negatives that I want to keep.
Thank you

Saif Nasser Ahmed Al-Hanati
Student Club of the Sultanate of Oman, Jordan

The negatives have gotten moisture in, without you knowing it. Maybe from a site you don't know.
As for the solution that is currently required of you, it is to put each negative in a special nylon envelope, then the collection is placed in another envelope and kept in a wooden box. And this is the best way to keep your negatives.. ⏹

⏺ Medical imaging problems

Please kindly provide some clarifications on the following points, with many thanks:
While photographing data and tables, write them in white on a black surface, then print them on another selected background after fixing the image. Are there any other notes?
When photographing small tables close-up - a graph of 7 by 10 cm, for example. It is difficult to make the back of the camera completely parallel to the subject, so the lines appear slanted. Is there a practical way to correct, noting that correction through the viewfinder is an exhausting process for the eyesight?
What is the method for photographing scientific samples through a light microscope, and can SLR cameras be used for this purpose?
What is the effective method for cleaning transparencies from acidification residues and fingerprints?

Friend Dr. Rabee
Othman

For the first point, there are no notes as long as you get good results. In the event that you encounter any difficulties, please send a form to give more accurate notes. As for photographing the tables, you cannot obtain satisfactory results unless you adopt:
A - Micro lens for close-up photography.
B - A special holder for the camera, and this holder is dedicated to these works and makes the back of the camera balanced and stable.
This stand is a table to install the camera on by means of a column at the end of the table so that the camera is facing the surface of the table, and if you need lighting, you can put 2 projectors on both sides to get a correct exposure.

The operation you are talking about takes place within specific medical specifications, knowing that some imaging companies have such capabilities.

Ricoh also makes some accessories that can
Install it on a camera (.S.L.R) and we will send you a brochure about the camera you have.
With a Ricoh address to write to for warranty
Get quick answers.
And if you do not get a result, please write to us again to find the company that produces this equipment. And here, of course, you have to change the equipment in your possession.

As for cleaning films and transparencies, we wrote about them in Issue No. 23 - in detail - ⏹


⏺ Practica Camera: Information

Please provide me with detailed information about the Practica 1000 and Practica 200 (B) cameras. Thank you.

Lutfi Dias
Homs - Syria

(1000 - Praktika)
They are well-structured cameras with a normal system, i.e. manual exposure. Shutter speed up to 1/1000 and sync speed with flash 1/125.

Aza disc up to 1600 - weighs 635 grams
The exposure scale is normal and is subject to a balancing process between the following signs 0 - 0, which means that the exposure is underexposure + overexposure, and the letter 0 is the exposure is correct.
As for the approximate camera price, it is $170.

(PRAKTICA B200)
It is also a compact camera
middle but can be used manually or automatically. Shutter speed up to 1/1000 and flash photography at 1/90.
It has all the other specifications found in modern cameras, with a zoom of up to 3200. The exposure push and exposure scale work through light flashes inside the viewfinder.
This camera can accommodate a movie drive motor (PRAKTICA B Windar) and its weight with the lens is 530 grams .. ⏹