Neodymium Moon and Sky-glow filter with built-in IR blocker and PG-coating
- a selective contrast filter, particularly suitable for all reflecting telescopes
- blocks particular regions in the visible spectrum where street lamp lighting and sky-glow due to scattered light are particularly irritating
- selective blocking reduces glare, but without reducing the ability to see important colour and brightness differences
- light transmission in the selected spectral ranges is over 95 %
- Fits in all standard filter threads; and can be combined, for example, with the plane-optical polished Baader IR cutting filter! So blur from unfocused infrared can be prevented - an absolute must for digital astrophotography
- plane-optical polished; can be used without any loss of sharpness as a single filter in front of a bino-viewer or for afocal projection with digital cameras (far away from the focal point!)
- stars appear much sharper when it is used with a DSLR camera due to the blocked IR range of the spectrum
- no drop in sharpness with magnifications above 200X, in contrast to flame polished filter glasses
- substrate (glass melt): neodymium doped coloured glass
- coating: 7-ply multi-layer hard coating / 'bullet-proof' dielectric IR blocking coating
- Hardened on both sides (ion beam hardened), absolutely scratch-resistant, water-resistant coating - can be cleaned as often as required
