Focal length 200 mm

Fish eagle in South Africa

Submitted by Jürgen Tenckhoff on Sun, 02/28/2021 - 12:18

The village named St Lucia by stranded Portuguese in 1554 is located in the uMkhanyakude district of the KwaZulu-Natal province of South Africa. This location is a popular starting point for excursions to the iSimangaliso Wetland Park, where many different animals can be observed and photographed. Apart from the impressive "hippos", the hippos that occasionally roam the town at night, we were also able to observe and photograph the majestic fish eagles on a tour through the wetlands.



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.


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.


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.


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.