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Knight Optical(UK) Ltd - [email protected] - +44 (0)1622 859444

Optical Domes for Underwater Cameras

Knight Optical supply custom dome and window solutions to underwater camera manufacturers globally. Our lightweight glass or acrylic optical domes can be built from your own drawings or custom designed in house by our experts using ZEMAX optical design software. We pride ourselves on our products reaching you on time and to specification while our technical sales team are always on hand to offer advice where required.

As photography becomes more accessible thanks to smart phones and lightweight personal recording devices, we understand that manufacturer’s need to constantly innovate to stay ahead of the crowd. Knight Optical’s precision custom designed optical products, made to specification at affordable prices, can make the difference.

Our aim is to understand our customer needs working with ISO10110, BS4301-1991, and MIL-PRF-13830B, we deliver optical components and sub-assemblies at the correct quality on time and within budget. Our core products include dome port lenses and cover windows, filters for underwater photography and traditional lenses for cameras. We have the capability to design domes through to complete camera lens assemblies in-house, so get in touch to find out how Knight Optical can make your vision a reality.

Domes for underwater cameras

Dome windows are hemispheres. The two optical surfaces are an equal thickness apart, creating a naturally strong shape that gets tougher under pressure. This makes dome windows ideal for underwater environments and in applications such as camera dome ports and submersible windows.

Typically the material used will depend on the working wavelength of the application with Schott N-BK7 or equivalent, Fused Silica (Spectrosil), Sapphire and PMMA acrylic most commonly used. N-BK7 or equivalent offers a tough, cost-effective solution for visible range applications while Fused Silica is ideal for wavelengths below 400nm. Sapphire is used for its rugged properties and is suitable for harsh environments where a softer material would risk damage. PMMA is lightweight and cheap to produce in bulk. Modern plastics are increasingly tough and in many cases offer near identical optical properties to the glass while saving considerably in weight. For infrared applications, we can provide sapphire domes.

Knight Optical offer several stock domes between 25mm to 100mm diameter, made from quality glass at affordable prices. These sizes have been specially chosen to suit our customers' applications and are among our most popular products. 

We also offer custom domes as part of our extensive optical design and manufacturing service. Custom parts can be manufactured from your own drawings or designed in-house by our experts. The table below shows just some of our custom dome capabilities.

Find out more about our Stock Domes here

Diameter (mm) 5mm to 300mm+
Thickness (mm) Dependant on diameter. Please ask for more information
Dimensional tolerances (mm) +/-0.05
Max. strength variation* (diopters) +/-0.2
Surface figure (fringes) < 10(5)
Concentricity (mm) < 0.05
Scratch/dig <20:10
Polish < P3
Material N-BK7 or equivalent, Fused Silica, PMMA, Sapphire and more
Mounting options Unmounted or custom mounted
Coating options AR coated for select wavelengths, ITO coated, Hydrophobic coated

* Strength variation relative to strength at peak of dome

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Whatever your project we will be happy to be involved; call our technical advisors for advice or submit your drawings here for a full quote within 48 hours.


Get in touch

Our Multi-Lingual Sales Team are here to help with your requirments:

UK +44 (0)1622 859444
UK +44 (0)1622 850614
UK +44 (0)1622 851078
+1 401 583 7846

International Shipping

We are able to ship to most countries at good rates, please click here for more info.

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