Περιγραφή
The SVBONY O-III SV115 2″ 18 nm is a professional astrophotography filter with an increased half-transmissivity window (FWHM) of 18 nm and spectral characteristics optimized for effective removal of light pollution. wavelengths of 495.9 and 500.7 nm emitted by ionized oxygen atoms, the recording of which is particularly important when photographing emission nebulae.
This filter combines the ability to almost completely eliminate the unwanted component coming from sodium and mercury lamps with high transmittance for the O-III spectral line, one of the most important from the point of view of astrophotography . It was made on a high-quality glass substrate, additionally secured with an anti-reflective layer. By increasing the half-width of the transmission window, this filter not only perfectly cuts out unwanted spectral lines emitted by mercury and sodium lamps, but also significantly improves the brightness of the photographed object.
Attention! The O-III filter is not recommended for visual observation or solar observation.
- The 2″ O-III filter useful for large aperture telescopes through which the light of the Moon can be extremely overwhelming. Allowing just for the Double Ionized Oxygen lines between 495.9nm to 500.7nm to pass through at 90%
- The filter enhances contrast during visual observation of gaseous and planetary nebulae in all sky conditions; 2″ filter allows high-contrast imaging even in areas with strong light pollution
- The filter made from high-grade glass with dichroic interference and antireflection coatings;not only useful at light-polluted sites; the contrast is also increased at dark sky sites;it can be used with all 2″ eyepieces
- The O-III filter completely blocks virtually all other visible wavelengths of light so views of nebulas are optimized;increases contrast through selective filtration-Anti-reflection coated to prevent glaring and ghosting
- Narrowband filter do not eliminate the effects of light pollution or increase the object’s brightness;in many cases, they increase the contrast between nebula and night sky, not brightening the nebula
