OPTICAL FILM SOLAR FILTERS:
SOLARLITE: NEW (Best Value) After years of R & D we have developed a new solar film that has the optical quality of glass with the advantages of impregnated polymer. Will never develop pin holes or scratches that can let in light and ruin a filter. Other advantages: Light weight and does not require re-balancing tube assembly, will not break, consistent yellow-orange solar image, even density with any aperture, flat surface compared to other thin film filters that have wrinkles and creases. Will not tear or puncture. Stronger than any other solar film on the market. Also available in sheets. Guaranteed 15 years.
SILVER-BLACK POLYMER: For making custom solar viewers, glasses and small aperture filters. Stronger than "Mylar" with the filtering properties protected within the substrate. Solar image is yellow-orange. Available in sheets and bulk rolls. Guaranteed 10 years.
FILTER TRANSMISSION: SolarLite & Silver-Black Polymer film: 1/1,000th of 1% (Optical Density 5). For both visual and photographic use.
FREQUENTLY ASKED QUESTIONS:
WHAT SIZE DO I ORDER? The application guide below lists sizes by clear aperture (filter size) and outside diameter (O.D.) of cell (inside cell wall that fits over and around telescope tube). Please note that the brands and sizes listed are only a guide. Telescope manufacturers sometimes make changes so we strongly recommend the O.D. of the telescope tube be measured to be sure the correct part number is chosen. Choose the closest cell O.D. that is LARGER than the O.D. measurement of your telescope tube, dew shield or lens holder. Example: cell size 4250 (4 1/4") would fit O.D. measurements from 4" to 4 3/16" . Do not choose a size the same as your O.D. since it will be too tight and not allow room for a felt lining. Self adhesive felt is included for custom fitting. If your application requires additional felt; Velcro, felt and other types of material can be found at most fabric or home improvement stores. We cannot take orders for felt.
ARE THE FILTERS COMPLETELY SAFE? SolarLite & Silver-Black Polymer film is completely safe for unlimited visual and photographic use when used as instructed. If handled with care all will last a minimum of 20 years to life. Solar filter MUST be first in line from sun and in front of any telescope or camera lens or mirror. Filter should NEVER be used behind any lens including eyepiece or finder.
DO THE ALUMINUM CELLS COME WITH THUMB SCREWS? Thumb screws may seem like a good idea, however, our extensive testing found that in most cases it's actually less secure than a felt lining which covers a lot more surface area for a secure friction fit. If If the tolerance is within a few thousands of an inch such as with eyepiece holders, it would be fine, but this is rarely the case. Thumb screws can also dent and scratch the tube and put strain on the filter. Thumb screws are simply a "one size fits many" manufacturing shortcut and provide a false security.
CAN THE TELESCOPE OPTICS GET HOT OR DAMAGED? No, all the heat and intense light is blocked before it can enter the telescope. Your telescope may get warm from sunlight shining on it, not from the small amount of visible light transmitted through the filter.
WHAT DETAIL IS VISIBLE? Sunspots and surface granulation are the two main features. The only detail that cannot be seen with a standard filter (commonly called white light filter) are prominence and flares which require our highly specialized H-Alpha filter system.
FULL APERTURE (SOLARLITE)
SOLARLITE FILTER SHEETS
8.5" x 11" (216mm x 279mm) $39.00 (S-8)
12" x 12" (305mm x 305mm) $49.00 (S-12)
See eclipse viewer page for quantity discounts on SolarLite and Silver-Black Polymer in bulk rolls for making custom eclipse viewers.