Product Description
150mm Diameter BK7 Plano-Convex Lens – 250mm Focal Length (f/1.67)
This large-format, fast-aperture plano-convex lens is crafted from high-quality BK7 optical glass and is in flawless, like-new condition. With a 150mm clear aperture and a 250mm focal length (f/1.67), it delivers exceptional light-gathering power for a wide range of optical projects—from serious DIY astronomy to high-intensity beam control.
Key Specifications:
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Diameter: 150 mm (≈6 inches)
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Focal Length: ≈250 mm
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f/#: f/1.67 (extremely fast for its size)
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Center Thickness: 28 mm
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Edge Thickness: 4 mm
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Material: BK7 Optical Glass (high clarity, >90% visible transmission)
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Coating: Uncoated
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Figure: Plano-Convex – curved surface on one side, flat on the other
Condition:
✅ PRISTINE – FLAWLESS
✅ NO SCRATCHES, CHIPS, OR CLEANING MARKS
✅ APPEARS UNUSED – OPTICALLY PERFECT
Recommended Applications:
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DIY Astronomy: Ideal as the objective lens for a 6-inch refractor telescope. Expect bright, detailed views of the Moon, planets, and star clusters (note: classic chromatic aberration present in single-element designs).
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High-Power Solar Concentration: For scientific demonstrations or small-scale energy projects (Use extreme caution: proper safety eyewear and setup required).
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Laser & Optical Systems: Focusing element for high-power laser cutting, engraving, or medical laser setups.
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Magnification & Inspection: Large-area magnifier for detailed inspection, reading, or educational displays.
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Beam Shaping & Condensing: Use in projection systems, illuminators, or custom optical benches.



