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Slide printing experience

Turn off the white light in the dark room, and leave on only the special light, or the safe light filter (red light).
Take photographic paper of the kind you will use to print your pictures, and cut out a strip of sufficient length to cover different parts of the picture, and wide enough to give you a general idea of ​​the whole picture.
Return the remaining piece of paper to the lightproof box, upside down.
Make sure the red filter is facing the magnifier lens, then rotate the magnifier. Place the test slide on the paper carrier and make sure that the sensitive sheet is facing up for exposure.

The right way to do the slide experiment is to use a long and thin slide because it covers parts that represent the most important elements in the image, and does not waste paper. Estimate the exposure time and try three exposures: one with the estimated aperture, a second longer, and a third shorter.
Photo 8 represents the slide experiment used to determine the correct exposure time for Photo 7. In this parable, we see the importance of the length of the slide, as it covers the sky, mountains, forest, lake, and person, and gives a correct idea of ​​the appropriate degree of exposure for all these elements of different lighting. If we used a small slide covering only the forest and the lake, it would give us the appropriate degree of exposure for these elements, that degree that might give us a dull sky in which clouds do not appear.

To do the slide experiment, take a piece of cardboard the size of the experiment slide, then remove the red filter from the front of the lens, press the exposure timer button, and after exactly ten seconds, cover half of the slide with the piece of cardboard and continue the exposure process for another ten seconds. Thus, you have shown half of the slide for ten seconds, and the other half for twenty seconds. Turn off the magnifier button, and write down on the back of the slide the exposure period and the f-stop aperture value for each part of the experiment, then the back of the slide to see the most appropriate exposure.