Baader Neodymium (Moon & Skyglow) Filter 1.25 inchThe best visual and photographic filter for contrast enhancement for all telescopes, without loss of image brightness! The effect of the element neodymium as filter material is very impressive. When added to optical glass, it enhances contrast, enhances the red colour in the image (especially with Mars and Jupiter) and it darkens the spectral region which is particularly marked by street lamp light, which is the biggest contributor to the nightly