Para ambas imagenes...

The photographs were obtained by Felix Hormuth from the Max Planck Institute for Astronomy and currently a staff astronomer at Calar Alto with a Canon EOS 450D digital camera, using focal lengths of 60 mm for the thunderstorm and 100 mm for the image of Sierra Nevada, at a sensitivity of ISO 1600. Both images are stacks of 10 single exposures with 30 s exposure time each.



En primer lugar, lo de Sierra Nevada... este es el texto que acompaña a la imagen...

The first image was taken the 9th of November 2008 from the catwalk of the 2.2 m telescope, facing west, and shows the moonlit and snow-covered highest peaks of Sierra Nevada mountain range at night. The most outstanding summit is Mulhacén, the highest point in the Iberian Peninsula (3482 m). The total exposure time of this image was 5 minutes, causing stars to appear as trails due to the rotation of the Earth. These trails are visible almost down to the horizon, a proof of the excellent transparency of the air. A cloud layer can be seen at the bottom of the image, far below the mountains, filling the Nacimiento river valley, that separates Sierra Nevada from Filabres range, where Calar Alto Observatory is located.

Fue tomada con una exposicion de 5 minutos, de ahi la estela de las estrellas que se aprecia... el hecho de que dichas estelas sean visibles hasta el horizonte da idea de la increible trasparencia de la atmosfera en esa zona...






Sobre la tormenta de Argelia...

The second image was taken in the early hours of November 14th 2008 in a cloudless night, also under moonshine, but towards the opposite direction (East-South-East). Here the horizon is defined by the sea at a distance of about 170 km. One can clearly see features at the local coast at a distance of 65 km, moving ships on the sea (appearing as trails due to the long exposure time) and, above all, a giant thunderstorm cloud. Though it may appear to be close, this thunderstorm was actually located at the coast of Algeria, close to the city of Mostaganem, at a distance of 270 km from Calar Alto. The location of the cloud was evaluated using Meteosat weather satellite image data, and the distance independently confirmed by assuming a typical maximum height of 10 km for the top of the thunderstorm clouds. This means that the flashes extend below the local horizon and may well hit not the sea but, actually, the African continent.

Se pueden apreciar las estelas de los barcos debido a la exposicion larga... la linea de costa se situa a unos 65 kms de Calar, la linea del horizonte se ve a unos 170 kms y la tormenta se situo, gracias al Meteosat, a unos 270 kms, cerca de la ciudad de Mostaganem, en la costa argelina...

BRUTALES FOTOSS!!!!!
 :D1

Brutaalll¡¡¡¡

Vaya par de fotones...

Sin palabras      Alucinantes fotos

Unas imágenes de esas que dejan sin palabras. Sin duda difícil de quedarse con una de las dos... pero la tormenta 

Dios mio que pasada de fotos, impresionante la tormenta pero mi Sierra Nevada...de lujo.

Imagenes muy guapas socio, extrañas a mas no poder, pero que buenas, estate atento por si acaso debemos salir corriendo hacia el calar, tengo libre hasta el proximo lunes...