Name: Optolong 3nm Dual-Band L-Ultimate Light Pollution Filter
SKU: 63b56ff768d862001a944d2b
Price: 11670.0 TWD
Availability: PreOrder

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Optolong 3nm Dual-Band L-Ultimate Light Pollution Filter

NT$11,670

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Description

High transmission of H-Alpha and Oxygen III emission lines (avg. 90% or higher)
FWHM: Ha 3nm, OIII 3nm
Use with colour DSLR, CMOS and CCD Cameras
2" Mounted Filters.
300-1000nm >OD4 Blocking Range
Supplied in a protective plastic case with EVA foam lining
B270 1.85mm Thick Glass
Fine-optically polished on both sides - ensures accurate λ/4 wavefront and <30 seconds parallelism over the both surfaces
Ultrasonic wave cleaned substrate with purified water - Cleanup by 13 stage purified water tank to remove impurities and dust effectively
Ion source assisted coating— For durability and resistance to scratching, as well as stability on CWL (central wavelength) - no deviation affected by temperature change
Stringent quality testing process - each filter is tested on a spectrophotometer and laser interferometer