ISO 64

Rainbow holograms in art

Submitted by Jürgen Tenckhoff on Fri, 09/25/2020 - 15:47

This example nicely shows the special effect of rainbow holograms: If you tilt them around the horizontal axis, the photo runs through the spectral colors. If you move them around the vertical axis, they show the three-dimensionality of the recorded object. This opens up many possibilities for art projects, since with this method you not only have three representable dimensions but also colors for designing the art object.

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Holography with argon laser

Submitted by Jürgen Tenckhoff on Fri, 09/25/2020 - 13:40

White light holograms are generated with coherent laser light (here an argon laser), but they meet lower coherence conditions when viewing. The recorded objects show up in parallel light, so that lasers can be dispensed with. This makes them very suitable for artistic projects.

This test recording was taken in 1979 at the chair for theoretical electrical engineering at the Ruhr University in Bochum.

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Half a hologram - all the information

Submitted by Jürgen Tenckhoff on Fri, 09/25/2020 - 12:45

Is there really all the information of a recorded motif in every fragment of a hologram? In this example, a broken photo plate is supposed to show us whether we can reconstruct the white-light hologram of a helicopter recorded in it. The photo plate was rotated again in 1-degree steps to the reference wave (focused beam of a light-emitting diode flashlight) for each individual photo, so that several views of the three-dimensional object can be observed from the recorded wave field (light amplitude and phase) of the

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Holography for science and art

Submitted by Jürgen Tenckhoff on Thu, 09/24/2020 - 18:11

While the intensity (amplitude) of the light is recorded in black and white photography, color photography also uses its frequency. In this way, two-dimensional images of our four-dimensional world are generated, which, with the appropriate image composition, can also create a perspective-spatial, three-dimensional impression and, through the choice and representation of a suitable motif, can also create the impression of a temporal component.

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Rainbow holograms for ID cards and art projects

Submitted by Jürgen Tenckhoff on Thu, 09/24/2020 - 14:43

Rainbow holograms are a special type of white light holograms. The technique for generating rainbow holograms was developed in 1968 by Dr. Stephen A. Benton designed. Rainbow holography uses a horizontal slit and / or cylindrical lenses to remove vertical parallax in the output image. This reduces the spectral blurring while maintaining the third dimension in the observation. If you look at a rainbow hologram that is moved around the horizontal axis, you only see the change in colors.

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Hamburg at the blue hour

Submitted by Jürgen Tenckhoff on Sun, 04/07/2019 - 19:49
From the jetties in Hamburg you can reach an excellent photo spot through the Elbe tunnel. From here, the city panorama as well as the yacht harbor and the Elbphilamonie can be perfectly photographed at the blue hour and of course at other times of the day and night. In this photo a long exposure time was realized in order to harmonize the rather strong waves on the Elbe.
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Photo technique: "Blue Hour"

Submitted by Jürgen Tenckhoff on Sun, 10/15/2017 - 18:55

The blue hour is of particular importance for photography.

Pictures taken at this time of day, when dusk changes to darkness after sunset, can create a mixture of unsettling melancholy and uncertainty about the threatening black of the night, the moods that, on closer inspection, have nothing to do with the subject. Perhaps they also evoke memories of experiences at this time of day, when our powerful sense, our visual perception, begins to lose its protective power with diminishing light and invisible dangers are suspected in the shadows ...

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