Thousand Oaks 3.25" Solarlite Film Solar Filter

Thousand Oaks SolarLite 3.25" Solar Filter (S-3250)

Reliable Solar Protection for 3.25" Aperture Telescopes

The Thousand Oaks SolarLite 3.25" Solar Filter (Part #S-3250) brings safe and sharp solar viewing to telescopes with an outer diameter of approximately 3.25 inches. Whether you're gearing up for a solar eclipse, observing sunspot cycles, or just enjoying daytime astronomy, this rugged and optically refined filter delivers consistent results every time.

At the core is SolarLite, Thousand Oaks Optical’s exclusive solar film. It combines the image sharpness of glass with the field-ready durability of polymer, making it ideal for both casual backyard use and serious eclipse chasing. Unlike many thin-film filters, SolarLite resists tearing, creasing, and degradation from repeated handling.

Key Features:

• Glass-Like Solar Performance: SolarLite film delivers high-resolution views of solar structure and sunspots

• Durable & Lightweight: Tear-proof and puncture-resistant without adding weight or affecting telescope balance

• Smooth Image Quality: Flat surface provides uniform density and excellent contrast across the aperture

• Felt-Lined Cell: Ensures a secure and scratch-free fit on optical tubes or dew shields near 3.25" in outer diameter

Compatibility:
Fits telescope front cells or dew shields with an outer diameter of approximately 3.25 inches. Always measure carefully to ensure a proper, safe fit.

Clear Aperture: 60mm or 2.37"

Cell OD:  82mm or 3.25"

SolarLite Film Technology:
After years of research and development, Thousand Oaks Optical has introduced SolarLite—a new solar film that delivers the optical sharpness of glass with the durability and resilience of a polymer. Unlike traditional solar films, SolarLite won’t develop pinholes or surface scratches that could compromise safety. It’s lightweight, so it won’t require rebalancing your optical tube assembly, and it's built to withstand the rigors of field use.

SolarLite offers a consistent yellow-orange solar image across the entire aperture with excellent contrast and uniform density. Its smooth, flat surface ensures sharper views compared to other thin-film filters that often suffer from wrinkles and creases. Tear-resistant, puncture-proof, and more rugged than any other solar film available, SolarLite sets a new standard for safe, high-quality solar observing.

Safety Note:
Before each use, inspect your solar filter for any damage or defects. Never observe the Sun without a securely attached, undamaged filter in place.

Tech Details: