Replacement Rubber Eyecups OT0042A for 3338 mm Eyepieces A soft, foldable rubber eyecup designed to improve comfort, protect your eyepiece, and reduce stray light during observation. Compact and portable for field use, with durable construction for long service life. Key benefits Comfortable viewing: Soft rubber cushions the eye area for longer, more comfortable observation sessions. Light blocking and eye isolation: Helps reduce stray light and reflections for clearer images at the eyepiece. Secure fit and compatibility: Sized to fit eyepieces in the 33 to 38 mm range, recommended for eyepiece lengths of 34 to 37 mm with a 36 mm inner diameter. Foldable and portable: Collapsible design makes it easy to store and transport without adding bulk. Durable material: Made from rubber for stable performance and long service life. Product details Model and color code: OT0042A, size range 33 to 38 mm Recommended eyepiece length: 34 to 37 mm Inner diameter: 36 mm Material: Rubber Quantity: 2 pieces per pack Features: Handheld design, portable Suitable for use with optical devices at magnifications up to 500X and under Practical use scenarios Field observation: Attach to a spotting scope or telescope eyepiece when birdwatching or stargazing to improve comfort and reduce glare during extended sessions. Laboratory or classroom microscopy: Use on compatible microscope eyepieces to help steady viewing, reduce stray light, and protect the eyepiece from oils and wear. Travel and storage: Fold the eyecups flat in your kit or case to save space and keep eyepieces protected while transporting equipment. Why choose this eyecup Simple, reliable replacement that restores comfort and functionality to your eyepiece. Clear sizing information makes it easy to confirm compatibility before . Comes as a pair so both eyepieces or spare replacements are available. Note on compatibility Designed for eyepieces with outer sizes between 33 and 38 mm and eyepiece lengths of about 34 to 37 mm. Inner diameter measures 36 mm. Confirm these dimensions with your eyepiece before installation.