Black box. Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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Black box. Focus secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

There is an ordinary box on the table. Show it to the audience, let them make sure: the box is empty. Then put the box on the table and take out of it ... one box, second, third, fourth. When the boxes are placed on the table, everyone can see that they take up much more than the box itself, from which they were just removed.

Focus secret:

The box has a double bottom, under which the boxes (when folded!) Are hidden from the audience before the demonstration of the trick. The boxes are made of cardboard, attach each end face with only one edge adjacent to the bottom of the box. Attach the ribbon to the opposite edges of these faces, having previously passed it through the hole in the upper edge of the box. These holes are located at the very edges of the upper face, above the place where the ribbon is attached to the ends. Both end faces are removed inside the box.

The box needs to be folded twice. Moreover, the ribbon must be on top. Now, when you pull the ribbon and shake it, the box will return to its original shape.

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Random news from the Archive

Canon Speedlite 470EX-A Smart Flash 01.03.2018

The Japanese company Canon has developed the Speedlite 470EX-AI flash with artificial intelligence, which is able to independently choose the optimal direction of light for the most uniform illumination of objects photographed by the camera.

For shooting in low light conditions, cameras use flashes - both built-in and more powerful external ones. Such devices allow you to illuminate the subject, but if you shoot the flash directly at the subject, it will turn out to be too bright in the photo, and the background will be dark and with contrasting shadows. To make the lighting more uniform, multiple sources are usually used.

When studio equipment is difficult to use, in the field, photographers aim their flash at another surface that reflects light, or attach diffusers to the flash. Canon decided to make their work easier for photographers and designed the Speedlite 470EX-AI flash, which automatically selects the optimal direction for lighting using artificial intelligence.

In auto mode, the flash turns towards the subject and illuminates it to calculate the distance, and then turns towards the ceiling or walls and calculates the distance to them. Having determined the position of the object in the surrounding space, the device calculates the most suitable angle for uniform illumination. However, nothing prevents the photographer from choosing the angle of illumination in manual and semi-automatic modes.

From the outside, the 470EX-AI flash looks just like any other flash, but inside it has motors in the base and hinge, and a sensor in the corner of the bezel. The maximum flash-to-subject distance is seven meters. Case dimensions are 74,6 x 130,4 x 105,1 mm, weight - 385 grams (excluding batteries). The smart flash will go on sale in April for $399.

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