The most valuable tool a lunar observer can own, this neutral density filter transmits light uniformly across the entire visual spectrum, allowing for glare-free observations of the Moon – and even impressive results when observing distant binary star systems.
Features:
13% light transmission
0.9 density
Reduces glare and irradiation in lunar observation
Allows for the distinction and separation of close double stars, where one of the binary pair significantly exceeds the other in brightness
Best for telescopes of 4" aperture or larger
Filters are essential tools of amateur and serious astronomers, allowing for the observation and photography of surface detail that is often invisible without filtration. By reducing irradiation caused by the motion of the Earth's atmosphere and improving color separation, a filter can – for example – mean the difference between seeing six festoons on Jupiter versus two.
Meade Series 4000 Filters measure 26mm in clear aperture and are manufactured from the purest crown optical glass, dyed-in-the-mass (not "color coated"). Each filter is anti-reflection coated on both sides and is mounted in a machined aluminum cell with the written number of the filter marked on the side of the cell. Filters may be piggybacked – or stacked – to achieve selective filtration of the visual color spectrum. For visual applications, Series 4000 Filters thread into the barrels of all Meade 1.25" eyepieces. Each filter is packed in a foam-fitted plastic case for secure long-term storage.
