Thousand Oaks 4.00" Solarlite Film Solar Filter

Thousand Oaks SolarLite 4.00" Solar Filter (S-4000)

High-Contrast Solar Viewing for 4.00" Aperture Telescopes

The Thousand Oaks SolarLite 4.00" Solar Filter (Part #S-4000) is designed to deliver safe, crisp views of the Sun through telescopes with an outer diameter of approximately 4.00 inches. Whether you're observing sunspots, watching the solar disk evolve, or preparing for a solar eclipse, this filter gives you the performance and protection you need.

Built using Thousand Oaks’ proprietary SolarLite film, this filter combines the image sharpness of glass with the strength and lightweight convenience of polymer. It's ideal for travel, outreach events, and everyday solar observing without compromising optical quality or safety.

Key Features:

• Precision SolarLite Film: Provides excellent resolution and contrast for solar detail

• Tough and Lightweight: Tear- and puncture-resistant film stands up to field use without requiring rebalancing of your scope

• Flat and Uniform: Delivers a consistent yellow-orange solar image with no creases or wrinkles

• Snug Fit: Felt-lined cell ensures a secure, scratch-free fit over your telescope’s front cell or dew shield

Compatibility:
This filter fits telescopes with an outer diameter of approximately 4.00 inches. Be sure to measure your optical tube or dew shield carefully to confirm fit before ordering.

Cell OD:  101mm or 4.00"

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.

Cell OD:  101mm or 4.00"

Tech Details: