

Espero que os gusten, a mi almenos me han sorprendido.




Mensajepor sevi92 » 02 Oct 2007, 19:03
Mensajepor apofis » 02 Oct 2007, 19:06
Mensajepor sevi92 » 02 Oct 2007, 20:14
javi_cad escribió:Hola, ¿cómo es el filtro casero que has usado?
Mensajepor rumbert » 02 Oct 2007, 22:34
Mensajepor sevi92 » 02 Oct 2007, 22:55
Mensajepor sevi92 » 02 Oct 2007, 23:00
I have been asked to comment on the safety of using devices such as floppy disk media, multiple layers of space blanket (a very thin type of aluminized polyester), compact disks (CDs) and metal coated polyester wrappers as solar filters.
Mensajepor rumbert » 02 Oct 2007, 23:25
I have recently also found a wide range of optical density between individual audio and data compact disks (CD and CD-ROM) because of variations in manufacturing processes. Some compact disks have aluminum films which are so thin that they appear semi-transparent at normal room illumination levels. These CDs are unsuitable for use as solar filters. Higher quality CDs are suitable for use if the aluminum coating is dense enough that the glowing filament of an incandescent light bulb is just barely visible through it.
Not recommended are: metal-coated polyester that is not specifically intended for solar observation, smoked glass, floppy disk media, black colour transparency (slide) film, floppy disk media, and compact disks (because of the inconsistent quality of the metal coating).
Mensajepor u00579 » 03 Oct 2007, 06:49
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