Description
JNHXSK China high quality and cheaper prices PVD ZnSe Dia 12/18/19/20mm Focal Length 50.8/63.5mm laser engraver cutter CO2
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Model |
laser focus lens |
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Material |
PVD ZnSe |
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Diameter |
12/18/19/20mm |
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Focus Length |
50.8/63.5mm |
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Diameter Tolerance |
+0/-0.13mm |
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Thickness Tolerance |
±0.25mm |
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FL Tolerance |
<±2% |
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Centration |
<3 arc minutes |
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Clear Aperture |
>90% |
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Surface Figure |
<λ/2 per 1"Dia(@)632.8nm |
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Surface Quality |
40-20 scratch and dig |
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AR/AR coating |
R<0.5% per surface (@) 10.6um |
1. The convex lens of the focusing lens is installed upwards. After replacing the lens, the lens barrel needs to be finely adjusted up and down, and it is fixed in the best effect position.
2. When using, please pay attention to the following points to prevent the lens from bursting and prolong the life of the lens.
3. The machine's air-cooled fault causes the lens to overheat and burst, or the air is not cold, and there is condensed water in the lens barrel to cause it to burst from hiding on the lens.
4.The back spray or liquid that occupies the carved material on the lens is prone to burst due to uneven heating for a long time. It is necessary to use a cotton swab to dip cleanly with anhydrous alcohol.
5. When dimming, the optical path hits the edge of the lens and the junction of the lens barrel, which can easily cause burst.
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A/ After payment is done and pass aliexpress checking, shipping will be made within 7 business days.
B/ We just will try our best to send out your goods as earlier as we can, but shipping is out of our control, so we will not accept any form of urging.Picky customers are unwelcome, please bypass. Happy shopping is the most important!
C/ If need fast shipping, please provide us your city and post code to check the shipping cost for you, our cooperated courier is DHL/TNT/EMS/UPS/FEDEX, remote area need pay more cost for remote delivey fees. Buyer pay courier cost and remote delivery fees.
A/ Import duties,taxes and your local fees are not included in the price or shipping charge .These charges are the buyer's responsibity.Pls make sure you can clear customs before order if can not clear customs before the deadline, your Customs will distroy the goods, and you have to bear all cost caused by the Customs clearance dealy. If want to send by courier like DHL, UPS, Fedex or EMS, pls provide us with your city name, post code, so we can check if arrive, if remote areas and how much they cost.
B/ Please check with your country's customs office to determine what these additional costs will be before you order.
C/ We usually mark the goods for a low cost on the customs declaration ,but we can't guarance no tax charge as it is depends on your country's policy, write smaller value also has risk, please be noted with this before order! if need show true value or other value please let us know in advance.
TO Russia:Please provide your full name
TO Brazil:by DHL/FEDEX need CPF NO.company's CNPJ NO.
TO Argentina:by DHL/Fedex need CPF NO.or company`s CNPJ NO and company name
1. Customer satisfaction is quite important to us. If you are satisfied with our products and service, Please give us positive feedback and 5 stars for us.
2. If there are any problems with your purchase, please contact us before leaving negative or neutral feedback. We will make our efforts to help you solve the problem.
