First, look at the packaging
Look at the package and see the certificate. General regular manufacturers, whether it is pure imported or domestically produced, will use the Chinese or English-language control word mark for packaging. For packaging, all English must be careful, and it is likely that small manufacturers will deceive consumers as “smoke bombsâ€. In order to maintain their reputation, regular manufacturers generally use environmentally-friendly raw materials that comply with national regulations. The behavior of small factories is difficult to guarantee.
Second, smell the smell
When buying wood material, you can immerse a small sample in boiling water and smell it is stimulating. Green building materials have low formaldehyde emission and generally do not smell pungent. If you smell a strong irritant or even make your eyes feel uncomfortable, it proves that the substrate of the floor contains a lot of free formaldehyde. Will pollute the air.
Third, ask the experts
When purchasing some large-scale building materials, many consumers who do not understand the price are easily overcharged by the business. Therefore, before purchasing, it is advisable to consult relatives and friends who are knowledgeable and ask them to recommend it.
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Our Dome Lens is an optical window composed of two parallel curved surfaces. Dome lenses are commonly used in meteorology applications, pyranometers, defence applications and often used in high pressure viewports in underwater cameras and submersibles.For this reason our dome offer both high transmission as well as durability. Other application for our dome include visible-range domes for pyranometers and infrared-range domes for pyrgeometers, and as high pressure viewports in underwater cameras and submersibles.
BK7 or K9L domes are used primarily in meteorology applications. BK7 offers excellent transmission from 300nm up to 2µm. BK7 is a relatively hard material, with excellent chemical durability.
UV fused silica domes ( JGS1 ): For applications operating in the deeper UV range, we offers a range of UV fused silica domes. Fused silica domes are commonly used in underwater applications at extremely high pressures.
Sapphire domes: For infrared applications we can provide sapphire domes. Sapphire is an extremely hard material with transmission of over 80% in the 2-5µm wavelength range. As with fused silica, sapphire is able to withstand extreme pressures, making it the perfect material for underwater camera and missile fairing applications.
Specifiation of our dome lens as follow:
Material:Optical glass N-BK7 , H-K9L, UV Fused Silica, Sapphire, and infrared crystal materials.
Diameter:20-350mm
Diameter Tolerance:+/-0.1mm
Thickness:>2mm
Thickness Tolerance±0.2~0.1mm
Center Deviation:3-5'
Surface quality:80/50 60/40
Coating: Antireflection Coating inside
Chamfers:0.2 x 45° typical
300Mm Diameter Dome Lens,300 Mm Diameter Hemisphere Dome Lens,Glass Dome Lens For Camera,Dome Lens For Subsea Shooting
China Star Optics Technology Co.,Ltd. , https://www.csoptlens.com