Thousand Oaks Solar Filter 165mm OD


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SKU: S-6500

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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 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.

What Size Do I Order?

How to Measure Outside DiameterThe size chart below lists sizes by the clear aperture (filter size in the center of the cell) and outside diameter (O.D.) of the aluminum cell (inside cell wall that fits over and around the telescope tube). The O.D. of our cells needs to be at least 1.5mm 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 (108mm O.D.) would fit instrument O.D. measurements from 102mm to 107mm. 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.



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. ie a shroud is mandatory for safe viewing. 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 the warranty.

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

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