Optical Double Concave Lens AR Coated for Camera/Projector/Telescope Applications
Brand Name:LONGWAY
Certification:ISO9001
Model Number:LW1609201411
Minimum Order Quantity:800 pieces
Payment Terms:D/P,T/T,Western Union
Place of Origin:Shanghai, China
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Shanghai Shanghai China
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Rm. 2111, Bldg. A, Tomson Center, No. 188, Zhangyang Rd., Shanghai, China
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Product Details
Optical Double Concave Lens AR Coated for
Camera/Projector/Telescope Applications
1. Material
Core: Precision-crafted from high-grade optical glass (e.g., BK7, Fused Silica) or specialized optical plastics.
Coating: Multi-layer Anti-Reflection (AR) coating deposited onto both concave surfaces. Common coating types target specific wavelength ranges (e.g., Visible: 400-700nm, NIR).
2. Key Properties
Shape: Features two inward-curving (concave) surfaces, causing light rays to diverge.
Focal Length: Has a negative focal length (e.g., -25mm, -50mm, -100mm).
Optical Power: Acts as a diverging lens.
AR Coating Effect: Significantly reduces surface reflections (often to <0.5% per surface), increases light transmission (typically >98% per surface in target band), minimizes ghosting/flare, and improves contrast.
3. Primary Function
To diverge incident light rays. Parallel rays entering the lens spread out as if originating from a virtual focal point in front of the lens.
To correct optical aberrations, particularly in compound lens systems (e.g., compensating for convergence/spherical aberration caused by positive lenses).
To increase the effective focal length of optical systems when placed before a primary lens.
To reduce overall system length in some designs.
4. Critical Applications
Cameras: Used in telephoto lens groups to extend focal length; in zoom mechanisms; for aberration correction; and as field flatteners. AR coating is vital for image clarity and light efficiency.
Projectors: Essential for beam expansion, aberration correction (especially in projection lenses), and focal length adjustment within illumination and projection paths. AR coating maximizes brightness and contrast.
Telescopes: Employed in eyepieces (e.g., Huygens, Ramsden designs) for magnification and field correction; in Barlow lenses to increase effective focal length/magnification; and for collimation adjustments. AR coating enhances transmission crucial for faint celestial objects.
Laser Systems: For beam expansion and optical path control.
| Material | Optical Glass, Fused Silica, quartz |
| Diameter Tolerance | +0/-0.15 mm |
| Thickness Tolerance | +/-0.15 mm |
| Cler Aperture | over 90% |
| Surface Quality | 80/50~10/5 |
| Transmission | above 92% |
| Chamfer | 0.1-0.5 mm x 45° |
| Focal Length Tolerance | +/-1.5% |
| Back Focal Length Tolerance | +/-1.5% |
| Coating | available |
| Usage | optical system, photographic sysem, Lighting system e.g. laser, camera, projector, magnifier etc. |
Optical Double Concave Lens AR Coated for Camera/Projector/Telescope Applications
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