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Filters > Nebulae filters > OIII Filters > Astronomik > OIII > Astronomik Filters 2" OIII filter
Product no.: 16759

Filters 2" OIII filter

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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.

Our expert comment:

Tip: Are you still looking for the right filter? Suitable recommendations by our experts in the magazine article [CMS://shop/i_id=1638 "With these eyepiece filters you are guaranteed to see more"]

Specifications

Capacity


Connection (to the telescope)
2"
Coating of optical system
multiple
Mount material
Aluminium
Frame
2"

General


Series
OIII
Type
Filters
Type of build
line filter

Area of application


Visually useful
yes
Useful for photographs
yes
Anti light-pollution
yes
Astronomik Filters 2" OIII filter
Light transmission curve

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