reflectivity, firstsurface optical reflector designed for DIY projectors and optical assemblies. The frontsurface (firstsurface) design eliminates double reflections and ghosting common with rearsurface mirrors, producing sharper, highercontrast projected images. Offered in multiple sizes; this listing is for the 270 x 180 x 3 mm size. Key benefits Cleaner, sharper images: frontsurface construction prevents the second reflection and internal substrate reflection that cause ghosting and loss of contrast. reflectivity: optimized for projection applications to keep more light in the optical path and preserve image brightness. Ready for DIY and : sized and finished for easy integration into homemade projectors, replacement of worn projector mirrors, and other optical projects. Thin and stable: 3 mm thickness balances rigidity and ease of mounting in compact projector housings. Main features and attributes Type: First surface optical reflector (frontsurface mirror). Reflectivity: reflectivity front surface suitable for projection and optical use. Size (listed): 270 x 180 x 3 mm. Availability: Part of a multiplesizes range for different projector and optical needs. Compatibility: Designed for DIY projector builds, projector mirror replacement, projection systems, and general optical assemblies where a frontsurface mirror is required. Practical use cases DIY projector builds: a rearsurface mirror with a firstsurface reflector to reduce double images and improve contrast in homemade projectors and shortthrow projection setups. Projector repairs and upgrades: Swap worn or lowperformance internal mirrors in portable or custom projectors to recover brightness and image sharpness. Optical experiments and assemblies: Use in optics benches, imaging tests, or custom mirror arrangements where accurate singlesurface reflection is required. Installation and handling notes Handle by the edges and avoid touching the reflective surface to prevent fingerprints or scratches. Mount securely in the projector or assembly to maintain flatness and alignment; small misalignment can degrade image quality. Keep clean with a soft, lint cloth and appropriate optical cleaning solution; avoid abrasive cleaners. What makes this product different Frontsurface (firstsurface) construction is specifically intended to eliminate the secondary reflection issue of conventional mirrors, making it a better choice for projection and precision optical work compared with standard backsilvered mirrors. Sized and specified for practical integration into DIY projector accessories and optical assemblies where space, thickness, and reflectivity matter. If you need a reliable frontsurface mirror for a 270 x 180 x 3 mm application in projection or optics, this firstsurface optical reflector provides the performance and form factor suited to DIY builds, repairs, and experimental setups.