Baader Digital Solar Filter 3.8 OD, aperture 120 mm, for tubes: 140-180 mm

Baader filter film for solar oberving enjoy great popularity - worldwide

In opposite to many glass solar filters, Baader AstroSolar Foto Film fullfills highest requirements for image quality and safety. Now Baader also offers professional cells which hold the film without tension, ensuring high image quality and best safety.

Baader Digital Solar Filter BDSF for high photographic magnifications

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.

Warning: 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.

OD 3.8 only offers 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.

ASTF - AstroSolar Telescope Filters - High-End Solar Filters:

Solar filters for telescopes come in a temperature-compensated cell. The film is mounted in a way which rules out any danger of breaking or tearing. Within a temperature range from -30 °C to +50 °C, the image quality is perfectly kept. Even after extremely fast temperature changes, like from a warm room into cold winter air, the ASTF solar filter is directly ready for use.

All Baader Digital Solar Filter sets contain:

original Baader AstroSolar® Foto Film (OD 3.8), mounted and quality checked by experienced members of the manufacturing company.

pure white, IR-reflecting aluminum front ring with stiffened inner and outer rims, shaped to protect the filter material against contact with sharp metal edges

three centering pins with brass inlays are used for centering the filter cell at the front of telescope. These pins have two different diameters for easier adaption to the telescope. Every pin has a corrugated rubber coating which makes sliding onto the telescope tube easy, but prevents from unintended slipping back.

the pins can be fixed without tool and allow engagement on a multitude of tube diameters. The pins fit as well to the outer side of the tube as on the inner one (if possible at all).

sliding aluminium blocks hold the pins. The blocks don´t turn and have a milled index pointing to a printed scale.

inserted cross-head srews allow additional tightening of the pins with a screwdriver

for fast and reproducible centering of the filter to different tubes, there is a scale next to every adjustment hole

shiftable black closing plates cover the adjustment holes and prevents unfiltered light from falling into the optics

three rubber plugs are used for closing unused adjustment holes

three safety belts with velcro and self-adhesive counterparts are used to fix the position of the filter in front of the telescope

the front side of every filer contains the warning sign: "Read the Instructions before use"

robust shipping cardboard box

Instruction

Baader offers a very good manual, the PDF can be downloaded here.