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FLI - Research Grade 28mm Luminance Filter


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Availability: In stock


Manufactured by: Finger Lakes Instrumentation

FLI - Research Grade 28mm Luminance Filter


FLI high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. FLI offers a full line of filter types and sizes. Complete sets are available as well as individual filters in both round and square shapes.


  • FLI Research Grade filter sets are par focal to F4.5 (individual filters are also available, contact FLI)
  • Size: 28mm
  • Shape: round
  • Thickness: 3mm +/-0.1mm
  • Bandwidth: N/A
  • Parallelism: 30 second or better
  • Surface Flatness: 1/4 wave per inch


Additional Information

Name FLI - Research Grade 28mm Luminance Filter
Manufacturer Finger Lakes Instrumentation
Model RG-28D-L
Parallelism 30 second or better
Shape Round
Size 28mm
Surface Flatness 1.25 wave per inch
Thickness 3mm +/-0.1mm