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White circular solar filter with black rim and two securing straps, 145mm diameter

Celestron

Celestron EclipSmart Solar Filter 5" Schmidt-Cassegrain 145mm

SKU CH-9HTM-78315

A safe solar filter blocking 99.999% of sunlight for 5" Schmidt-Cassegrain telescopes with 145mm diameter, ISO 12312-2 certified and secured by hook-and-loop straps

  • ISO 12312-2 certified safety blocks 99.999% intense sunlight
  • Precision fit for 5" Schmidt-Cassegrain telescopes with 145mm external diameter
  • Scratch-resistant polymer material delivers crisp orange-tinted solar images
  • Dual hook-and-loop straps plus four tabs secure filter during observation
  • Ready for 2023 annular and 2024 total solar eclipse viewing

Solar filter for 5" Schmidt-Cassegrain

The Celestron EclipSmart Solar Filter is a dedicated accessory that converts a 5" Schmidt-Cassegrain telescope into a safe solar viewing instrument. It blocks 99.999% of intense sunlight for direct observation of eclipses and sunspots. The filter is ISO 12312-2 certified for solar safety and fits models such as the NexStar 5SE and C5 Spotting Scope.

145mm external diameter fit

The single specification that determines compatibility is the 145mm (5.71") external diameter, precision-engineered for Celestron 5" Schmidt-Cassegrain optical tubes. A secure fit is reinforced by two 1x4" nylon hook-and-loop straps and four 1x1" hook-and-loop tabs that prevent accidental dislodging during use. If your telescope has a different front aperture this filter will not mount correctly.

Scratch-resistant polymer under solar load

The filter uses a scratch-resistant polymer film by American Paper Optics that maintains optical clarity during prolonged solar observation. Unlike brief glances, extended sessions at high magnification place continuous thermal and radiant stress on the material; the polymer construction resists degradation and preserves the crisp orange-tinted image throughout the event.

Highlights

  • ISO 12312-2 certified safety blocks 99.999% intense sunlight
  • Precision fit for 5" Schmidt-Cassegrain telescopes with 145mm external diameter
  • Scratch-resistant polymer material delivers crisp orange-tinted solar images
  • Dual hook-and-loop straps plus four tabs secure filter during observation
  • Ready for 2023 annular and 2024 total solar eclipse viewing

Specifications

No published specifications for this item yet.

Questions about this item

How much sunlight does the filter block when I point my 5" Schmidt-Cassegrain at the sun?

It blocks 99.999% of intense sunlight, letting you safely view solar eclipses and sunspots with an orange-tinted image.

What safety standard does the ISO 12312-2 certification actually guarantee for this filter?

It confirms the filter meets international requirements for direct solar viewing, meaning the material and construction are tested for eye safety.

Will the 145 mm external diameter and included straps fit my NexStar 5SE securely?

Yes, the filter is engineered for Celestron 5" Schmidt-Cassegrain models like the NexStar 5SE, and the two hook-and-loop straps plus four tabs hold it firmly in place.

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