Refer to Chart Below For Sizing
and Order By Part # on Right Side of Chart
NEW!!! (and Best Value) After years of R & D Thousand Oaks has developed a new solar film that has the optical quality of the glass with the advantages of impregnated polymer (Thousand Oaks Optical Black 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.
WHAT SIZE DO I ORDER?
The application guide below lists sizes by clear aperture (filter size) and outer cell wall inside diameter (I.D.) The I.D. of the cell slips over and around the O.D. of the telescope tube or lens holder. Please note that the brands and sizes listed are only a guide. Telescope manufacturers sometimes make changes so we strongly recommend the outside diameter of the tube be measured to be sure the correct part number is chosen. Choose the closest outer cell I.D. size larger than the outside diameter measurement of your instrument. Example: part # 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. Ample felt is included for custom fitting.
ARE THE FILTERS COMPLETELY SAFE?
SolarLite, Glass 2+ & Black Polymer filters are completely safe for unlimited visual use. If handled with care all will last a minimum of 20 years to life.
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 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 glass. 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) SIZING CHART
|CLEAR APERTURE||CELL OD||PART #|