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SKU : AK-8H00NL
Product Details
Astronomik SII Narrowband Filters are suitable for false color imaging of emission nebulae emanating singly ionized sulfur. The contrast between an object glowing at 672nm and the background is increased significantly due to the high transmission and effective out-of-band blocking!
The SII line (672nm) is in the deep red portion of the spectrum, beyond H-alpha.
This Astronomik SII MFR Narrowband filter has a 6nm FWHM. The extra narrow bandpass of 6nm filters are most appreciated with cameras that offer extremely low dark current and good cooling, or when imaging in areas with severe light pollution. The higher level of out-of-band blocking allows you to take longer exposures and choose objects embedded in normally over-bright, crowded areas of the Milky Way. Extra blocking causes faint stars to disappear from the background, and brighter stars will be pin-pricks of light.
Highlights
Ten Year Warranty! Astronomik filters will last for many years without degradation of the coatings, due to the quality of the substrate and coatings used. The high-quality glass is optically polished and is free of stress and striae. The coatings used on Astronomik filters are applied in multiple layers, making the resulting filter scratch resistant and unaffected by moisture or aging that some filters of less quality may be prone to. Astronomik filters are also parfocal due to the small thickness tolerance allowed. Astronomik backs up this quality with a ten-year warranty.
specifications
Filter Type | SII |
Free Shipping | Yes |
FWHM Bandwidth | 6nm |
Shape | Round |
Warranty | 10 Year Warranty |
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Filter band new in great shape. Fast shipping and service
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