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Frequently Asked Questions 
 
What markets do we sell to?
As an OEM optical components manufacturer we serve a variety of industries including safety, military, electronics, medical, automotive, and consumer eyewear. All of our products are plastic or polymer-based.

What are the key advantages of plastic optics?
Compared to glass, plastic optics are generally lighter weight, less costly, and available in a greater range of designs and configurations.

What is a prism corrected lens?
Prism-correction is a design feature for improved optical performance that is available in molded optics. The design provides for a thinner cross-section as one moves from the optical center to the periphery.

Do we have stock lenses?
The only stock lenses we have are plano spherical and plus power magnifying lenses available in polycarbonate. We do have open mold frames that can be utilized with custom-built inserts.

Do we manufacture glass lenses?
No. Everything is polymer based. The coatings are designed for plastics which have much different processing requirements than glass elements.

What types of mirror coatings do we offer?
We offer standard mirror and reflective coatings employing metals and refractory oxides that can be deposited at substrate temperatures under 250 degrees F. One material we do not offer, at this time, is Magnesium Fluoride coatings due to the high temperature required.

What is your typical lead-time?
For our flat windows typically 4-5 weeks. These windows made from CR-39® are fabricated on a precision laser from sheet stock. For lenses requiring construction of injection mold tooling, the lead-time can vary from 10 weeks to 25 weeks depending on the complexity of the lense design.

What is the largest lense you can do?
For a molded lense we have designed and manufactured optical elements as large as 12" x 14".

What is an AR coating used for?
Anti-reflective (AR) coatings are used to minimize reflected light on an optical surface. Reflected light is generally 4% per surface; AR coatings can reduce that to under 1% per surface, resulting in improved transmission and opto-electronic efficiency.

Do you make infrared filters?
There are many types of filters that are referred to as infrared filters. One type that we do manufacture is a filter that blocks visible light from 400 nm to 780 nm, but allows infrared light to pass through. CR-39® is particularly suitable for this type of filter due to its excellent transmission of infrared light.

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FOSTA-TEK OPTICS INC. | 320 Hamilton Street Leominster, MA 01453 | (978) 534-6511 | info@fosta-tek.com 100% Made In USA  |  ISO 9001:2015 Registered 
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