Compact 4mm Eyepieces for 1.25 Astronomical Telescopes

The SVBONY 1.25" fully coated eyepiece is perfect for a wide range of astronomical observations. It is well-suited for broad field lunar observations, medium-sized star clusters, and a variety of cloudy nebulas and deep sky targets.

If you're new to stargazing and unsure of what equipment you need, this eyepiece can help you make an informed decision. When considering a telescope, it's important to understand its capabilities and how to calculate the optimal magnification for the objects you wish to view. The magnification equation is: Magnification = objective focal length / eyepiece focal length. Typically, you don't want to exceed 2x per mm of your telescope's diameter, as this can result in blurry images. Therefore, it's crucial to research the best magnification for the celestial objects you plan to observe.

The package includes the SVBONY 4mm Aspheric Eyepiece, which can be an excellent Halloween, birthday, or Christmas gift for the stargazer in your life.

The fully multi-coated (FMC) glass optics of this eyepiece increase light transmittance, enhancing the details you can see on Jupiter, Saturn, Mars, and Venus. The blackened lens edges and internal extinction thread further reduce scattered light, providing crisp, high-contrast images.

The eyepiece features a standard 1.25" (31.75mm) fitting diameter, allowing it to be used in any astronomical telescope with a 1.25" focuser. Both ends come with dust caps to protect the lenses when not in use, and the caps are interchangeable and easy to use.

This 4mm eyepiece is suitable for a variety of astronomical observations, including watching the scenery, bright celestial objects, nebulae, broad field lunar observations, medium-sized star clusters, and cloudy nebulas and deep sky targets. It's particularly well-suited for viewing the Moon and planets.

Specifications: - Focal length: 0.16 inch / 4mm - Field of view: 62° - Fitting diameter: Standard 1.25" (31.75mm) - Eye lens diameter: 0.39 inch / 10mm - Coating: Fully coated, high-definition - Optical system: Aspheric Eyepiece - Weight: 1.48 oz / 0.09 lb / 42 g - Elements: 3 Elements, 2 Groups

The 4mm focal length of this eyepiece offers high magnifications, allowing you to look more closely and see more details on the Moon's surface and other planets. The wide 62-degree field of view, combined with the fully coated optics, provides maximum detail and definition across the entire field of view, making it an excellent choice for a variety of astronomical observations.

The aspheric design of the eyepiece, compared to a spherical design with the same refractive index, results in a thinner and lighter lens, making it well-suited for planetary observation and deep sky objects.

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