After years of R&D Thousand Oaks Optical has developed a new solar film that has the optical quality of glass with the advantages of impregnated polymer. Will never develop pinholes or scratches that can let in light and ruin a filter.
Other advantages: lightweight 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.
What Size Do I Order?
The size chart below lists sizes by clear aperture (filter size in center of cell) and outside diameter (O.D.) of aluminum cell (inside cell wall that fits over and around telescope tube). The O.D. of our cells needs to be at least 1/16″ larger than the OD of the telescope tube or binocular barrel etc. Choose the closest cell O.D. that is LARGER than the O.D. measurement of your instrument. Example: Part number S-4250 (4 1/4″ O.D.) would fit instrument 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. 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.
OPEN TRUSS TELESCOPES:
If the solar filter is to be used on an open truss telescope, the open area from front (secondary mirror) to back (primary mirror) must be covered. No direct sunlight should enter the optical path or the concentrated beam from the mirror can focus on the back of the solar filter film and cause damage and void warranty.
| CLEAR APERTURE | CELL OD | PART # |
|---|---|---|
| 40mm\1.50″ | 50mm\2.00″ | S-2000 |
| 45mm\1.75″ | 60mm\2.32″ | S-2325 |
| 50mm\2.00″ | 70mm\2.75″ | S-2750 |
| 60mm\2.37″ | 76mm\3.00″ | S-3000 |
| 60mm\2.37″ | 82mm\3.25 | S-3250 |
| 80mm\3.15″ | 90mm\3.50″ | S-3500 |
| 80mm\3.15″ | 95mm\3.75″ | S-3750 |
| 80mm\3.15″ | 101mm\4.00″ | S-4000 |
| 90mm\3.50″ | 108mm\4.25″ | S-4250 |
| 101mm\4.00″ | 114mm\4.50″ | S-4500 |
| 101mm\4.00″ | 120mm\4.75″ | S-4750 |
| 101mm\4.00″ | 127mm\5.00″ | S-5000 |
| 101mm\4.00″ | 133mm\5.25″ | S-5250 |
| 114mm\4.50″ | 139mm\5.50″ | S-5500 |
| 127mm\5.00″ | 146mm\5.75″ | S-5750 |
| 127mm\5.00″ | 152mm\6.00″ | S-6000 |
| 127mm\5.00″ | 158mm\6.25″ | S-6250 |
| 127mm\5.00″ | 165mm\6.50″ | S-6500 |
| 152mm\6.00″ | 181mm\7.12″ | S-7125 |
| 152mm\6.00″ | 190mm\7.50″ | S-7500 |
| 152mm\6.00″ | 203mm\8.00″ | S-8000 |
| 177mm\7.00″ | 212mm\8.37″ | S-8375 |
| 177mm\7.00″ | 222mm\8.75″ | S-8750 |
| 203mm\8.00″ | 236mm\9.312″ | S-9187 |
| 203mm\8.00″ | 241mm\9.50″ | S-9500 |
| 203mm\8.00″ | 247mm\9.75″ | S-9750 |
| 203mm\8.00″ | 254mm\10.00″ | S-10000 |
| 203mm\8.00″ | 266mm\10.50″ | S-10500 |
| 228mm\9.00″ | 273mm\10.75″ | S-10750 |
| 254mm\10.00″ | 292mm\11.50″ | S-11500 |
| 254mm\10.00″ | 305mm\12.00″ | S-12000 |
| 254mm\10.00″ | 311mm\12.25″ | S-12225 |
| 279mm\11.00″ | 317mm\12.50″ | S-12500 |
| 254mm\10.00″ | 330mm\13.00″ | S-13000 |
| 304mm\12.00″ | 349mm\13.75″ | S-13750 |
| 317mm\12.50″ | 387mm\15.25″ | S-15250 |
| 355mm\14.00″ | 406mm\16.00″ | S-16000 |
| 355mm\14.00″ | 432mm\17.00″ | S-17000 |
| 355mm\14.00″ | 447mm\17.625″ | S-17625 |