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HOYA Longpass Filters

 A longpass (LP) Filter is a coloured glass filter that attenuates shorter wavelengths and transmits (passes) longer wavelengths over the active range of the target spectrum (ultraviolet, visible, or infrared).
Aband-pass filter passes frequencieswithin a certain range and rejects (attenuates) frequencies outside that range.
HOYA Longpass Filters
All HOYA® Filters are made using only GENUINE HOYA optical colour filter glass material

MATERIAL:
HOYA ®Filter Glass

SURFACE QUALITY:
Ø12.5mm≤ 3 fringes

DIAMETER TOLERANCE:
+0.0 / -0.2mm

SURFACE QUALITY:
Ø25.0mm≤ 5 fringes

SQUARE TOLERANCE:
± 0.2mm

SURFACE QUALITY:
Ø50.0mm≤ 8 fringes

THICKNESS TOLERANCE:
± 0.2mm

PARALLELISM:
≤ 3 arc minutes

SURFACE QUALITY:
60/40

EDGES:
fine ground

Visit the Galvoptics Ltd website for more information on HOYA Longpass Filters

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