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Your questions answered

For any small orders of our standard stock parts, we encourage you to use our website to place an order and make payment.
This is a much easier procedure and processing these types of orders internally essential resources.
For this reason we have a minimum order value of $300/£250/€250 that we use for accepting POs.

If you have purchased an optical component that has an AR coating on one side, you may be wondering how to identify which side is which.

  • Method 1

You will need to set up the component, tilted slightly down and away from you, with the reflection of a light source that is extending beyond the furthest edge of the part from you eye.

If you have a strong reflection that goes to the edge, the uncoated side is facing up.

If the reflection broken just before the edge, the coated side is facing up. What you are seeing in this scenario is the reflection from the bottom, uncoated, surface.

It is not uncommon for AR coatings to have a colouration to them. Often when the coated side is facing up, the reflection changes colour at the edge.


  • Method 2

This technique can be a little more difficult to identify the coating, but particularly useful if the optical component is very thin or has a large chamfer.

Using the same setup as above, you will need to cast a shadow on the top surface.
You can use an object, such as a pencil, you can cast a shadow through the reflection of a light source.
Creating a shadow on the coated side would result in a ghost shadow being cast underneath the normal shadow: if this was to occur on the uncoated side, the ghost shadow would appear above the normal shadow.
The ghost shadow will often appear coloured, depending on the type of AR coating.



When you buy products sold and shipped from outside your country, you, as the recipient, are responsible for paying import taxes and duties based on the laws of the country into which the products are being delivered. These will either be due in order to release your shipment or on receipt of the goods, depending on the delievery method selected.

At the time of order, our product pages would tell you if the parts you ordered was ready in stock for shipping. If not, it will give you a good indication as to how long it might take to fulfill your order.

If in the unusual event of your order not arriving within the times indicated on our shipping page, please contact our customer services team [email protected]
Depending on the shipping option used, we should have provided you with tracking details when your order was despatched.
Please note that, from time to time, there may be an issue that you need to resolve directly with the courier.

We can ship to most countries. Please view our shipping page for information on our times and rates.
If you cannot find your country, please contact our customer services team [email protected]