Astronomik Filters OIII 12nm CCD 2'' (16818)

Narrowband filters redefine performance and durability for imaging and research. These filters enhance the contrast of emission targets by reducing background signals, allowing faint nebular structures to stand out more clearly. With a guaranteed >90% transmittance at the emission wavelength, they provide the highest signal possible. Narrowband filters are especially effective at minimizing halos around bright stars, even during long exposures of 30-45 minutes, which are typical in astrophotography. Additionally, these filters are coated to the edge and edge-blackened to minimize stray light while blocking most light outside the narrow bandpass.

Contrast is the essence of narrowband imaging. Narrower filters reduce background noise and bring out faint features more effectively. However, maintaining a high signal (%T at the emission line) as the filter narrows is both challenging and costly. The >90%T guarantee ensures that you can achieve superior contrast compared to cheaper 7-8.5nm filters on the market. For example, images of the Crescent Nebula (NGC 6888) taken under identical conditions demonstrate how narrower bandwidths make the nebula and its faint surrounding nebulosity "pop" against the background. Recent advancements in production technology have further improved transmittance to 97-98% at emission wavelengths.

Specifications:

• Connection: 2"
• Coating: Multiple coatings
• Mount material: Aluminium
• Frame size: 2"

General Information:
This filter belongs to the OIII 12nm series and is a line filter designed for a wide range of applications.

Applications:
It is highly effective for photography, visual observation, and anti-light pollution purposes. It is suitable for observing hydrogen nebulae, planetary nebulae, and supernova remnants. While it excels in these areas, it is not recommended for observing objects such as comets, central stars, twin stars, or galaxies and star clusters. It can also be used for daylight and twilight observations as well as viewing planets like the Moon, Mercury, Venus, Mars, Jupiter, Saturn, and Uranus.