Modern Design Daystar Off Axis Erf 90mm With 325mm Cap # E-325f90 [best Value] [3OLlXPkm]

Daystar Off Axis ERF 90mm with 325mm Cap

The Daystar Off Axis ERF 90mm with 325mm Cap is a premium solar filter designed for Schmidt-Cassegrain telescopes (SCTs). This research-grade filter boasts a 90mm clear aperture and a 325mm diameter off-axis cap, ensuring optimal performance and protection for your optical system. With its advanced design, this filter effectively reduces heat load and provides safe, high-contrast solar viewing. Key features include a 90mm clear aperture, a 325mm diameter off-axis cap, and the ability to combine with a Barlow lens for ideal f/30 imaging conditions.

Product Specifications and Technical Details

The Daystar 90mm Energy Rejection Filter (ERF) is engineered to absorb or reflect unwanted ultraviolet (UV) and infrared (IR) light, while allowing transmission of the visible spectrum. This ensures the protection of both your optics and solar filter components. Made from red or yellow glass or dielectric-coated substrates, this filter also functions as an aperture mask, ensuring a perpendicular light path into your solar filter system. It is optimized for use with Daystar filter assemblies at f/30 or slower, providing superior performance for advanced astronomical observations.

Practical Uses and Benefits

The Daystar Off Axis ERF 90mm with 325mm Cap is ideal for astronomers, astrophotographers, and hobbyists seeking high-quality solar observations. Its custom-made design ensures a precise fit based on your telescope’s dew shield dimensions, providing a secure and non-marring attachment. This filter is a must-have for anyone looking to enhance their solar viewing experience, as it offers numerous benefits, including reduced thermal stress, improved contrast, and a longer lifespan for your telescope’s optical components. Whether you are a seasoned astronomer or a beginner, this research-grade filter is the perfect choice for safe and enjoyable solar observations.