ICC N BK7 and N SF11 Bi Concave Lenses, Uncoated,Negative Focal Length
- Category: Lenses >>>
- Supplier: Qinhuangdao Intrinsic Crystal Technology Co. Ltd.
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Features
* Material: N-BK7 or N-SF11
* N-BK7 Wavelength Range: 350 nm - 2.0 μm
* N-SF11 Wavelength Range: 420 nm - 2.3 μm
* Focal Lengths from -6.0 mm to -100.0 mm Available
* Spherical Surface Irregularity: λ/4
* N-BK7 Wavelength Range: 350 nm - 2.0 μm
* N-SF11 Wavelength Range: 420 nm - 2.3 μm
* Focal Lengths from -6.0 mm to -100.0 mm Available
* Spherical Surface Irregularity: λ/4
Bi-concave lenses have a negative focal length and are best used to diverge a converging beam. Similar to a plano-concave lens, a bi-concave lens can diverge a collimated beam to a virtual focus like in a Galilean-type beam expander. Since the Abbe Number of N-SF11 (25.76) is lower than that for N-BK7 (64.17), lenses fabricated from N-SF11 will exhibit higher dispersion than those fabricated from N-BK7.
Product Paramenter
Diameter | Focal Length | Diopter | Radius of Curvature | Center Thickness | Edge Thickness |
6.0 mm | -6.0 mm | -166.7 | -9.7 mm | 1.5 mm | 2.5 mm |
9.0 mm | -9.0 mm | -111.1 | -14.4 mm | 2.0 mm | 3.4 mm |
1/2" | -15.0 mm | -66.6 | -24.0 mm | 3.0 mm | 4.7 mm |
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1. Product choosing
Our company have the large quantity of standard products in our stocks. Customer can choose the products according to the
acquirement, such as size, technical data and Coating characteristics. Also, we can produce the special optical products according
customers’ demand.
2. Product preserving
Optical components should be protected with dry situation and suitable temperature without being used. Please clean it with gauze
and cotton dipped in special cleaner (20% anhydrous alcohol + 80% ether mixture)
3. Quality assurance
Please check out the products when you received with the courier being attendance. Within 30 days after receiving the products,
you can contact me freely and provide your testing report if there is something unartificial damage and disqualification technical
data. We will be responsible for free charge repairmen, change and return.
4. Payment terms
The payment terms can be flexible and can be cash, T/T and Paypal.
5. Delivery terms
We can deliver stock products within 7 work days, and within promissory delivery time for customized products.
Our company have the large quantity of standard products in our stocks. Customer can choose the products according to the
acquirement, such as size, technical data and Coating characteristics. Also, we can produce the special optical products according
customers’ demand.
2. Product preserving
Optical components should be protected with dry situation and suitable temperature without being used. Please clean it with gauze
and cotton dipped in special cleaner (20% anhydrous alcohol + 80% ether mixture)
3. Quality assurance
Please check out the products when you received with the courier being attendance. Within 30 days after receiving the products,
you can contact me freely and provide your testing report if there is something unartificial damage and disqualification technical
data. We will be responsible for free charge repairmen, change and return.
4. Payment terms
The payment terms can be flexible and can be cash, T/T and Paypal.
5. Delivery terms
We can deliver stock products within 7 work days, and within promissory delivery time for customized products.
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