AstroSolar® Photo Film OD 3.8 is only intended to be used by well-experienced Astro-imagers. This material is not intended to serve for protection during visual solar observation. Also PhotoFilm is not necessary for imaging the sun with camera- or tele-lenses, the resulting exposure time would be much too short, respectively the results would cause severely overexposed images.
Photo Film solely is used in conjunction with astronomical telescopes – and only in connection with fast digital video cameras. This combination is highly apt to capture finest solar surface detail and granulation at extremely high magnification – but enabling ultrashort exposure increments measured in milliseconds – in order to “freeze” atmospheric turbulence . The results are quite outstanding as can be seen in the image gallery and in the customer reports.
Do not use this material until you are convinced to having gained sufficient experience with the hazards of Solar videography while using regular AstroSolar®Safety Film ND 5.0.
PhotoFilm OD 3.8 consists of the same optically treated carrier film with just diffraction limited properties as our AstroSolar® Safety Film with optical density 5.0. The density of the adjacent multiple coatings however has been reduced for Photo Film in a very controlled fashion. OD 3.8 constitutes the border line, to still offer an absolute minimum of eye safety, in case someone would handle with the film and – in spite of extensive care – would accidentally catch up a split second view of the intense solar energy near focus. Still every amount of precaution must be undertaken to avoid just this to happen.
[box type=”warning”]Sadly AstroSolar® Photofilm OD 3.8 may not be used for visual solar observation – not even in combination with additional neutral density filters nor other filters of any kind.[/box]
This size of AstroSolar® Photo film covers telescope up to 20″ diameter. Or you can use it to make a wide variety of filters for all your binoculars, telephoto lenses or smaller telescopes.
Share this big size film with the members of your astronomy club