BK7 BI-CONCAVE LENSES (SAR MgF2)

An anti-reflection (AR) coating of Magnesium Fluoride (MgF2) has been applied to reduce light reflection and increase transmission. MgF2 is a very common and cost-effective single-layer AR coating

The primary purpose of the MgF2 coating is to minimize the amount of light that is reflected away from the lens surfaces. This is based on the principle of destructive interference, where the thin film of MgF2 cancels out the reflected light waves. A typical uncoated lens can reflect around 4% of the light per surface, but an MgF2 coating can reduce this to less than 1.5% over a wide wavelength range.

When deposited correctly, MgF2 coatings are hard and durable, making the lens more resistant to scratches and environmental damage. This durability is important for lenses used in harsh environments or those that require frequent handling and cleaning

DIA50.8mm BK7 Bi-Concave Lens (SAR MgF2) f-250mm

P/N: POL-BK7-BCV-50.8-250-SAR

General Specifications

Substrate Material: BK7 optical glass;
Wavelength Range: 350-2000nm;
Lens Configuration: Bi-concave;
Design Wavelength: 633nm(n=1.515082)
Outer Diameter(OD): 50.8,-0.2/+0.0mm
Center Thickness(Tc): 5.0mm;
Edge Thickness(Te): 7.5mm
Effective Focal Length(EFL): -250mm designed @ 633nm
Surface Quality: 40/20 scratch and dig
Centration: < / = 3 arc minutes
Coating: AR coated, single-layer MgF2 (double surfaces)

Pricing Overview (Excl. Taxes and Fees)

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DIA50.8mm BK7 Bi-Concave Lens(SAR MgF2) f-400mm

P/N: POL-BK7-BCV-50.8-400-SAR

General Specifications

Substrate Material: BK7 optical glass;
Wavelength Range: 350-2000nm;
Lens Configuration: Bi-concave;
Design Wavelength: 633nm(n=1.515082)
Outer Diameter(OD): 50.8,-0.2/+0.0mm
Center Thickness(Tc): 5.0mm;
Edge Thickness(Te): 6.6mm
Effective Focal Length(EFL): -400mm designed @ 633nm
Surface Quality: 40/20 scratch and dig
Centration: < / = 3 arc minutes
Coating: AR coated, single-layer MgF2 (double surfaces)

Pricing Overview (Excl. Taxes and Fees)

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DIA50.8mm BK7 Bi-Concave Lens (SAR MgF2) f-500mm

P/N: POL-BK7-BCV-50.8-500-SAR

General Specifications

Substrate Material: BK7 optical glass;
Wavelength Range: 350-2000nm;
Lens Configuration: Bi-concave;
Design Wavelength: 633nm(n=1.515082)
Outer Diameter(OD): 50.8,-0.2/+0.0mm
Center Thickness(Tc): 5.0mm;
Edge Thickness(Te): 6.3mm
Effective Focal Length(EFL): -500mm designed @ 633nm
Surface Quality: 40/20 scratch and dig
Centration: < / = 3 arc minutes
Coating: AR coated, single-layer MgF2 (double surfaces)

Pricing Overview (Excl. Taxes and Fees)

Stock Availability