William Optics 90 degree prism diagonal 1,25 (D-EP90-125-RC51III) for WO RedCat 51 III WIFD diagonals opinie

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The William Optics 1.25" 90° erecting prism diagonal D-EP90-125-RC51III (new 2025 version, William Optics, SKU: D-EP90-125-RC51III) is a high-quality prism diagonal designed exclusively for the William Optics RedCat 51 III WIFD telescope. The BaK4 prism with anti-reflection coatings provides high contrast and good light transmission, while the image is correctly oriented (up is up, left is left), which is especially convenient for daytime and terrestrial observing. The body is made of precision CNC-machined 6061T aluminium with a matte blackened, threaded interior to effectively suppress stray light.

Key features

• 90° erecting prism diagonal for correct-image viewing
• dedicated specifically to the William Optics RedCat 51 III WIFD telescope
• BaK4 prism with anti-reflection coatings for high transmission and contrast
• standard 1.25" barrel on the telescope side and 1.25" eyepiece holder
• full 6061T aluminium body, CNC machined
• internally matte blackened and threaded to reduce internal reflections
• particularly well suited for daytime and terrestrial observations
• manufactured in Taiwan, covered by a 2-year William Optics warranty
• note: limited backfocus – not all 1.25" eyepieces may reach focus

Included items

• William Optics 1.25" 90° erecting prism diagonal D-EP90-125-RC51III

Technical specifications

• manufacturer: William Optics
• model: D-EP90-125-RC51III
• diagonal type: erecting prism diagonal
• angle: 90°
• telescope side: 1.25" barrel
• eyepiece side: 1.25" barrel
• prism material: BaK4 optical glass
• optical coatings: anti-reflection coated
• internal finish: matte blackened, threaded interior
• housing material: 6061T aluminium, CNC machined
• intended use: daytime and terrestrial observing with RedCat 51 III WIFD
• compatibility: William Optics RedCat 51 III WIFD only
• not compatible with: RedCat 51 v1, v1x, v2, v2.5 (L-RC51II-U) and RedCat 71
• country of manufacture: Taiwan
• warranty period: 2 years