Select from following categories to find the help you need.
If you don’t see your question here, please contact us.

Products / Technical

Q. What methods are the lenses manufactured by?

A. Most of our products are manufactured by Heat compression molding. Please contact us for more details.

Q. What does “Aperture” of Fresnel lens mean in specification?

A. We carry two types of Fresnel lenses: one type in which the Fresnel grooves do not extend to the corners (which are flat), and one type in which the Fresnel grooves extend to the corners of the lens.

A. For example, the CF50-B has a size of 100mm square and an aperture of 100mm. In this case, the size and aperture are the same because the corners have flat areas.
In contrast, the CF150-B has a size of 200mm but an aperture of 283mm. This is because the grooves cover the full surface of the lens.

Q. What is the heat resistance of the lenses?

A. Most of NTKJ’s standard products are made of PMMA. PMMA’s “Heat Deflection Temperature” is approximately 95 degrees Celsius. Therefore we recommend to maintain under 80 degrees Celsius to have safety margin. For heat exposure lasting longer, it is recommended to operate lower than 60 degrees Celsius approximately. We always recommend you to purchase sample lenses to tryout at your operating environment to verify and verify functionality.

Price / Quotation

Q. How much does product cost?

A. Please refer to NTKJ’s online quotation site. If you need to customize or to order 10 or more lenses, please contact us with your requirements.

Q. Can I get a discount for buying in bulk?

A. Discount applies for purchases of 10 or more. Please contact us for quotation via contact form.

Q. I couldn’t find the product I was looking for on your website, what should I do?

A. NTKJ accepts requests for custom products. Feel free to consult us about your ideal product.

Q. Can you trim / add a hole / modify standard products?

A. Yes, we can do it for additional trimming fee which is depending on the modification. Please ask us for details with your specification.

Order / Payment

Q. How do I place an order?

A. If you are ordering off-the-shelf product, please use NTKJ’s online quotation request form. For customize product inquiry, please our Contact page to speak with one of our sales engineers. You can also find information on our “How to order” page.

Q. How can I pay for my orders?

A. We welcome payment by CreditCard (using Paypal) or bank transfer.

Q. I would like to get a free-of-charge sample of your products.

A. Unfortunately NTKJ cannot provide free-of-charge samples of our products. We have prepared various off-the-shelf lenses for you to test and evaluate. If you would like to try our products, please purchase one of off-the-shelf lenses, which can be purchased from just one unit.

Q. Do you have an agent in my country?

A. NTKJ operates international sales from Tokyo, Japan. All international orders can be placed at our Tokyo headquarters.

Q. Is there a MOQ (minimum order quantity)?

A. For our standard products, orders can be placed from one unit. For customized product, MOQ varies depending on the specification.

Q. Is deferred payment possible?

A. Basically, we request advance payment. However, if you cannot make advance payment, please consult one of our sales engineers for payment details.

Q. What is the currency available for payment?

A. USD is the first option. EUR and JPY can also be available upon request (NTKJ’s internal exchange rates apply to EUR).

Packing / Delivery

Q. How long does it take for orders of standard products to be delivered?

A. Products that are in stock will be dispatched in about a week. Products that are out of stock will be dispatched in about 2-4 weeks.

Q. How long does it take to make a custom mold?

A. It takes between 4 to 10 weeks approximately for a custom mold to be created. The length varies depending on the specification of the custom mold.

Q. Which Incoterms apply?


Q. How is a forms of packaging?

A. Products are packed in a PE form, carton or bag depending on size and quantity. If you have a special requirements, please consult us.

Q. Products of our order were arrived, but products were damaged.

A. Please describe the details of the damage from Contact page.
Our products were through inspection. If products were damaged during shipping and incoterms was EXW, please contact shipping company.