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Model: 8H0006Brand: AstronomikFilter Type: Nebula/Deep Sky
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From the start, the Astronomik OIII filter has been very specifically designed for the visual observation of gaseous and planetary nebulae. The extremely narrow pass band of the two OIII lines brings a substantial contrast gain to these lines even under best observation conditions. On faint super nova remnants and faint planetary nebulae the Astronomik OIII filter will often make the difference as to whether the object can bee seen or not!
The optimal aperture ratio for the use of the filter is 1:3 to 1:15 with apertures of more than 6" (150mm). Transmission losses and chromatic distortions, which arise with other filters, occur with Astronomik OIII filters only when extremely bright aperture ratios of 1:3 and more come into play. The Astronomik OIII filters thus can expand the view of dispersed objects, generally speaking, to the whole visual field of view of the eyepiece and are not limited to only the center of the eyepiece.
Main useSince enough light must be available to make use of the OIII filter it is best to use this filter with apertures of more than 6" (150mm). Smaller instruments do not gather enough light for meaningful and satisfying astronomical work. However, please note: Many experienced Deep Sky observers, with apertures of more than 10" (250mm), prefer using the OIII filter instead of the more versatile UHC filter. Due to the high optical quality of the Astronomik OIII filter substrate you will see the same needle-sharp stars as you would from your regular telescope.
SuitabilityVisual observation (dark skies): Very good, huge contrast enhancement at O III-emission nebulasVisual observation (urban skies): Very good, huge contrast enhancement at O III-emission nebulasFilm photography: It depends, very long exposure timeCCD photography: Good, when used with an additional IR-block-filterDSLR photography (original): Very good, huge contrast enhancement at O III-emission nebulasDSLR photography (astro modified): Very good, huge contrast enhancement at O III-emission nebulasDSLR photography (MC modified): Good, when used with an additional IR-block-filterWebcam / Video (Planets): UnsuitableWebcam / Video (Deep Sky): Reasonable, if light pollution is a big problem and OIII Objects are beeing observed
Technical DataTransmission of nearly 100% of both OIII linesComplete blocking of all disturbing wavelength coveragesThe ideal filter for telescopes 10 " (25cm) and largerMain operational use: Planetary nebulas & super nova remnantsNo moisture-sensitivity, no aging, and totally scratch-proofExcellent carrier material - substrate is optically polished. The optical performance (resolution & contrast) of your telescope is not reduced in any way by the filter.Parfocal with other Astronomik filtersGlass thickness: 1mmCompletely resistant against high humidity, scratches and aging effectsDiffraction limited, the filter will not reduce the optical performance of your telescope!Astronomik filters are delivered in a high-quality, long lasting, filter box
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