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Galvoptics Ltd,  Harvey Road,  Burnt Mills Industrial Estate,  Basildon,  Essex,  SS13 1ES.

Telephone +44 (0) 1268 728077

Fax +44 (0) 1268 590445

FILTERS & AIRFIELD LIGHTING

 

SCHOTT    HOYA    KOPP    GELATIN   SIGNALLING LIGHTING

 PHOTOGRAPHIC FILTERS   NEBULA FILTERS

 

 

We hold large stocks of all optical filter glass types.

Please click on the links to see the range of filters we hold stocks of.

We also have stocks of miscellaneous and obsolete glasses. Please call for details.

All materials can be custom manufactured to your exact specifications.

 

 

SCHOTT FILTER GLASSES

We hold large stocks of most Schott filter Glass, and have stocks of materials that are now classed as obsolete. Please click here to go to our Schott Filter glass page.

 

 

HOYA FILTER GLASSES

We hold large stocks of Hoya filter glass, and pride ourselves in being one of the very few Optical companies that Hoya Corporation will allow to purchase raw material. This enables us to process orders quickly, and  produce filters to fulfil customers urgent requirements. Please click here to go to our Hoya filter glass page.

 

KOPP FILTER GLASSES

We Hold large stocks of Kopp / Corning filter glass. Please click here to go to our Kopp filter glass page.

 

GELATIN FILTERS

We stock a full range of Gelatin filters. All available to be cut your specific size.

We also offer a full range of N/D gelatine filters from 0.1ND to 4.0ND

Please contact us for more details

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SIGNALLING LIGHTING

 

We supply a range of lighting for both Airfield & Railway signalling.

Please contact us for details

 

 

IR PHOTOGRAPHIC FILTERS

 

IR FILTER TYPE

TRANSMISSION 50%

Wratten 25

600 nm

Wratten 89B

720 nm

Wratten 88A

750 nm

Wratten 87

800 nm

Wratten 87C

860 nm

All the above filters are 85 mm x 85 mm, and are manufactured from precision optical grade CR39

 

 

NEBULA FILTERS

 

Night Image 1, 2, and 3 filters help observers to see fainter and more difficult targets. Light pollution falls into three types, NATURAL, LOCAL, and REGIONAL.

 

Natural light pollution called ‘airglow’ is caused by charged particles from the SUN bombarding oxygen in the Earths upper atmosphere. Its strongest wavelengths are between 560 to 630 nanometers. Whilst not discernibly visible to the naked eye, it may still decrease contrast in the eye piece to ‘hide’ dim targets.

 

Local light is nearby glare that infringes on observing sites from street light etc. A filter cannot stop this. All you can do is shade your observing position.

 

Regional light pollution is the real problem. Populated areas, roads and motorways pour light into the sky. These and other sources combine to create the orange gray haze we see above our cities and towns. The right filter can help to reduce this by suppressing the ‘bad’ wavelengths, but allowing the ‘good’ wavelengths from celestial objects to pass through.

 

The NIGHT IMAGE range of filters, are designed to dim and blockout the areas of the spectrum which are a problem. In doing this, the net visual effect is, ‘increased contrast’ between the object and the filter darkened background.

In short, it can enhance the visibility of the object.

The problem wavelengths are:

High pressure sodium vapour lights between 550 and 630 nanometers.

Mercury vapour lights between 405 and 436 nanometers

Low pressure sodium lights emit mainly a narrow region approx 590 nanometers

 

THE THREE NIGHT IMAGE FILTERS WE SUPPLY HAVE MULTI-LAYERED INTERFERENCE COATINGS.

 

NIGHT IMAGE 1

A  broad band filter for observation of the night sky

@ £POA

 

NIGHT IMAGE 2

A narrow band filter for those interested in spotting fine detail in emission and planetary nebulae.

@ £POA

 

NIGHT IMAGE 3

A broad band filter for night observation and photography using red-sensitive film, such as ILFORD SSX 200 or KODAK Tech Pan 2415, both black and white films. If you use colour films, these filters will produce cyan tinted stars.

@ £ POA

 

SET ALL THREE FILTERS

£POA

 

 

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Phone +44 (0) 1268 728077

Fax +44 (0) 1268 590445

This document maintained by sales@galvoptics.fsnet.co.uk

Material copyright Ó2003 Tim Wale