Ra UHC 1.25" Filter This filter was designed for observations of dim and low-contrast deep-sky objects. The passband includes the Hß wavelength (4861 Å) and the OIII doublet (4959 Å and 5007 Å). Some planetary and emission nebulae are emitting up to 90% visible light in this range. This filter, therefore, enhances the contrast of nebulae details from 2 - 5% to 10 - 50%. This filter has a barrel diameter of 1.25" and can be mounted on the eyepiece of your OTA. Usage: General use product. May be used by kids over 3 years old.
Price: 74.48
