50mm positive meniscus acrylic lens 18 inch focal length

Product Description

Premium Optical-Grade Acrylic Positive Meniscus Lens – 2″ (50mm) Diameter, ~18″ Focal Length

Elevate your optical projects with this high-quality positive meniscus lens, crafted from crystal-clear PMMA acrylic for exceptional light transmission, impact resistance, and durability. Whether you’re teaching the fundamentals of optics, building a DIY projector, or exploring creative photography, this lens delivers sharp, distortion-free performance at a fraction of the weight and cost of glass.

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🔍 Key Specifications:

• Diameter: 50mm (2 inches)

• Thickness: 7.5mm (robust, rigid, warp-resistant)

• Focal Length: ~18 inches (457mm) – gentle positive power

• Design: Positive meniscus – strongly convex front, very subtle concave rear

• Material: Optical-grade acrylic (PMMA) – lightweight, shatterproof, UV-stable

• Surface Quality: Excellent – pristine; no scratches, grooves, or casting defects

• Edge Finish: Smooth polished edge – ready for custom mounting

• Condition: Like-new surplus – carefully stored

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✅ Condition & Notes:

• Condition: Excellent – Pristine Surfaces

• Origin: Surplus from educational or industrial optical stock

• Visual: Completely clean – no haze, crazing, or abrasions

• Includes: Lens only – no handle, frame, or mounting hardware

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⚙️ Why This Lens Excels:

🧪 Superior Meniscus Design:
Unlike simple plano-convex lenses, the positive meniscus configuration (convex front + subtle concave rear) minimizes spherical aberration and delivers sharper, more uniform focus across the aperture—ideal for imaging and projection applications.

💎 Optical-Grade Acrylic:

• 92% light transmission – nearly equivalent to uncoated glass

• Impact-resistant – will not shatter if dropped

• UV-stable – will not yellow over time

• 50% lighter than glass – easier to mount and position

📏 Generous Focal Length:
The ~18-inch focal length provides comfortable working distance for:

• Low-power magnification (1.5–2x) with wide field of view

• Projection optics with manageable throw distance

• Light collection without extreme curvature

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🛠️ Applications & Uses:

🔬 Optics Education & Demonstration:

• Teach refraction, focal points, real/virtual images

• Demonstrate chromatic aberration vs. achromats

• Safe, shatterproof option for student labs and outreach

🔍 Low-Power Magnification:

• 1.5–2x comfortable viewing of maps, documents, circuit boards, or fine print

• Large 50mm aperture provides wide, bright field of view

• No eye strain – ideal for extended reading or inspection tasks

📽️ DIY Projection & Imaging:

• Condenser lens in overhead or slide projectors

• Objective lens in simple telescopes or viewfinders

• Close-up photography – creative diopter effects

💡 Light Collection & Beam Control:

• Gather light onto sensors, solar cells, or photodiodes

• Soften or spread LED or lamp beams

• Prototype optics for custom instruments

🧰 Maker & Hobbyist Projects:

• Build a smartphone projector or magnifying lamp

• Create a wide-field viewer for birding or nature study

• Experiment with lens combinations for unique effects