Explore Scientific 4.7mm 82° 1.25″ eyepiece
Looking for an eyepiece that gets you as close as possible to the details of planets, the Moon or bright nebulae - without compromising on image quality? The Explore Scientific 4.7mm with an 82° apparent field of view is exactly the choice that will satisfy an experienced observer as much as a demanding amateur. This eyepiece combines a short focal length with a large apparent field of view - a combination that is by no means a given in short eyepieces. Its solid construction, waterproofing and nitrogen filling make it a reliable companion even during observation sessions in adverse weather. Simply put - this is an eyepiece you can count on for many years to come.
Optical design and coatings
This wide-field eyepiece uses an optical design consisting of seven elements arranged in four groups. Such a complex construction suppresses both spherical and chromatic aberrations even at such a short focal length, while maintaining a sharp image across the entire 82° field of view. All optical surfaces are treated with EMD (Enhanced Multilayer Deposition Coating) anti-reflection multi-layer coating, which significantly reduces unwanted light reflections and maximises light transmission.
The result is an image with high contrast, rich colours and minimal ghosting or flare. For comparison - poor-quality anti-reflection surfaces can absorb or scatter up to 10-15% of light at each surface, while the EMD coating reduces this loss to a fraction of a percent.
Build quality and construction
The eyepiece is fully waterproof and nitrogen-filled, protecting it against moisture condensation inside the eyepiece body - a problem that affects cheaper alternatives and can permanently damage anti-reflection coatings. All internal surfaces of the eyepiece body are blackened to eliminate unwanted reflections from metal surfaces that would otherwise reduce image contrast.
- Standard 1.25″ barrel diameter - compatible with the vast majority of telescopes on the market
- Weight of 220 g reflects a robust, solid construction with no unnecessary savings on materials
- Nitrogen-filled, sealed body prevents internal fogging and protects coatings
- Blackened internal surfaces for maximum contrast
The overall impression is a precision-crafted instrument that inspires confidence with every use.
Comfort and observing experience
The 13.6 mm eye relief ensures a comfortable viewing experience - you do not need to press your eye directly against the lens and can still see the entire field of view comfortably, even when wearing glasses. The short 4.7 mm focal length combined with the 82° field of view makes this eyepiece ideal for high-magnification planetary observation, where you will appreciate both the sharpness of detail and the relatively large area of sky in view.
When observing Jupiter, you will see not only the cloud belts and spots, but also enough of the surrounding sky for easy orientation. The wide field of view also makes it easier to track the movement of objects at high magnification without the need for constant telescope position corrections. The combination of comfort, contrast and sharpness makes this eyepiece a true pleasure to use.
Explore Scientific - a brand built on consistent quality
Explore Scientific is a brand that has established a strong position among astronomers thanks to consistent quality and a serious approach to optical design. The Explore Scientific 82° series eyepiece represents one of the best price-to-performance ratios in its class and is popular with amateur astronomers as well as experienced observers looking for reliable working optics.
The consistent use of EMD multi-layer anti-reflection coatings on all surfaces, the waterproof construction and nitrogen filling demonstrate that the manufacturer has real-world usage conditions in mind - not just catalogue specifications. Service availability and spare parts support are additional arguments in favour of choosing this brand. Investing in Explore Scientific eyepieces is an investment in the joy of every observation session for many years to come.
Specifications
| Parameter |
Value |
| Focal length |
4.7 mm |
| Apparent field of view |
82° |
| Barrel diameter |
1.25″ |
| Eye relief |
13.6 mm |
| Optical design |
7 elements in 4 groups |
| Coatings |
EMD (Enhanced Multilayer Deposition Coating) |
| Waterproof |
Yes |
| Nitrogen-filled |
Yes |
| Weight |
220 g |
