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Astronomy > Filters > Nebulae filters > OIII Filters > Astronomik > OIII 12nm CCD > Astronomik Filters OIII 12nm CCD 1.25"
Product no.: 20600

Filters OIII 12nm CCD 1.25"

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Product description

Bring Out The Faint Structures In Nebula

Narrowband filters set a new bar of performance and durability for imaging and research

They enhance contrast of emission targets by lowering your background signal. The guaranteed >90% transmittance at the emission wavelength provides you with the highest signal available. Narrowband filters are renowned for minimizing halos around bright stars, even for long exposures of 30-45 minutes typical of narrowband imaging in astrophotography. Lastly, Narrowband filters are coated to the edge of the part and are edge blackened. This is critical to minimize stray light for a filter that blocks most light except for the narrow bandpass.

Narrowband filters for imaging are all about contrast. What do we mean by this? Contrast brings out faint features by reducing the background – the narrower the filter, the better. The problem is keeping the signal (%T at the emission line) constant as the filter becomes spectrally narrower. This is why our >90%T guarantee is so important, even though it becomes very costly to manufacture. But, this assures you that you can take advantage of the improved contrast with our narrower filters compared to the much less expensive 7- 8.5 nm filters on the market. You can see the increase in contrast in the sequence of equal-exposure images of the Crescent Nebula (NGC 6888) taken on the same system and on the same night. As the bandwidth becomes narrower, the nebula “pops” out of the background, as does the faint surrounding nebulosity. Actually, the >90%T is a legacy specification, since new production technologies employed over the past 3-4 years routinely produces 97-98%T at the emission wavelengths.

Specifications

Capacity


Coating of optical system
multiple
Mount material
Aluminium
Connection (to the telescope)
1,25"
Frame
1,25"

General


Series
OIII 12nm CCD
Type
Filters
Type of build
line filter

Area of application


Visually useful
yes
Useful for photographs
yes
Anti light-pollution
yes
Daylight and twilight observation
-

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*All prices include VAT plus shipping costs.

Astronomik Filters OIII 12nm CCD 1.25"

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