Eyepiece Explore Scientific 15mm LER 52° 1.25 inch 60 degree

The Explore Scientific 15mm LER eyepiece with a 52 mm barrel diameter and 1.25-inch fitting provides a 60° apparent field of view and medium focal length magnification suitable for a range of astronomical observing tasks. Designed for use with standard 1.25" focusers, this eyepiece aims to balance image scale and field size to make planetary, lunar and brighter deep-sky targets accessible at moderate power while offering comfortable eye relief for extended viewing sessions.

Advantages

This eyepiece combines a 15mm focal length and a 60° apparent field to produce a useful blend of magnification and contextual field. The 1.25-inch mounting ensures compatibility with common telescope focusers. Optical design and eye relief are intended to reduce eye strain during longer observing periods and allow easier use with eyeglass wearers. The eyepiece construction supports stable, repeatable insertion and focus with standard telescope accessories.

Suitable for

• Planetary and lunar observation at moderate magnification
• Brighter deep-sky objects where a balance of magnification and field is desired
• Visual observing sessions requiring comfortable eye relief
• Users with standard 1.25" focusers and common telescope mounts

Key specifications

• Focal length: 15 mm
• Apparent field of view: 60°
• Fitting size: 1.25 inch barrel
• Eye relief: designed for comfortable viewing (suitable for extended sessions and eyeglass wearers)
• Optical purpose: medium-power visual astronomy eyepiece for planetary, lunar and brighter deep-sky targets

How to use

Insert the eyepiece into a clean 1.25" focuser and secure it using the focuser's locking mechanism. Start with low-power alignment if necessary, then switch to the 15mm eyepiece for moderate magnification. Achieve critical focus by making small adjustments to the focuser while observing a high-contrast feature such as the lunar limb or a bright star. If using with eyeglasses, adjust eye position to obtain the full field of view while maintaining the designed eye relief. When finished, retract or remove the eyepiece and store it in a protective case.

Usage recommendations

For best results, collimate your telescope and allow it to reach thermal equilibrium before high-magnification observing. Use appropriate filters for planetary or lunar observing to enhance contrast, and clean optical surfaces only with recommended tools to avoid scratches or coating damage.