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Time Saver Daystar Erf 100mm With 140mm Cap # E-140n100 Flash Sale: 90% Off [d7ls9NE0]

$57.99 $185.99 -69%

Daystar ERF 100mm Refractor Filter with Cap Introducing the Daystar ERF 100mm with 140mm Cap, a precision-engineered filter designed specifically for refractor telescopes. This state-of-the-art filter is crafted to enhance your observing experience b

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Time Saver Daystar Erf 100mm With 140mm Cap # E-140n100 Flash Sale: 90% Off [d7ls9NE0]

Daystar ERF 100mm Refractor Filter with Cap

Introducing the Daystar ERF 100mm with 140mm Cap, a precision-engineered filter designed specifically for refractor telescopes. This state-of-the-art filter is crafted to enhance your observing experience by reducing heat load and blocking harmful UV and IR radiation, while allowing the transmission of light within the visible spectrum. With its robust construction and tailored design, this ERF is a must-have for any astronomy enthusiast looking to maximize the performance of their refractor telescope.

Key Features and Specifications

The Daystar ERF 100mm stands out with its 100mm clear aperture housed in a precision cell, ensuring optimal light transmission and minimal light loss. This filter includes a 140mm inside diameter cap for a secure fit, making it compatible with a wide range of refractor telescopes. Key features include:
  • Protects your optics by blocking harmful UV and IR radiation
  • Passes visible light for safe and clear solar viewing
  • Acts as both an ERF and aperture mask to optimize the optical path
These features make the Daystar ERF 100mm an essential accessory for achieving sharp images and enhancing your celestial observations.

Practical Uses and Ordering Information

Whether you're a hobbyist or an experienced astronomer, the Daystar ERF 100mm with 140mm Cap is a versatile tool for your telescope. Designed to work best with DayStar filter assemblies operating at f/30 or slower, this filter is perfect for enhancing resolution and achieving larger apertures when used with a Barlow lens. When ordering, please specify the exact model of your refractor telescope and the precise outside diameter of your telescope's dew shield at the front to ensure a custom fit. This research-grade product is made-to-order in the USA and typically ships within 2–3 weeks. Don't miss the opportunity to elevate your astronomy experience with the Daystar ERF 100mm with 140mm Cap.

What Our Customers Say

January 26, 2026

Absolutely no complaints!

The best that I have ever bought in a very, very long while.

- Gwydion B..

January 26, 2026

Absolutely no complaints!

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- Gwawl P..

January 26, 2026

Absolutely no complaints!

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- Manawydan N..

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