Memorial Day Sale - Extra 5% off Used gear thru May 31st. Discount will be reflected in your shopping cart at checkout.
Yes, our inventory is accurate!
Qualifies Towards Free Ground Economy Shipping (CONUS Only) For Most Orders Of $149 Or More
Condition:
This is a used Zhumell filter set including the O-III, SkyGlow, and UHC filters in excellent condition. They are clean, with no marks on the optics nor bodies except the UHC filter does have a mark that can be seen in the provided photos. They each come in their original jewel case.
(Any dust you see in the photos is easily removable - it seems that these filters develop an electrostatic charge such that the dust in the air is just attracted to the filter.)
Description:
This O-III filter allows light transmission in the doubly ionized oxygen wavelengths. This is particularly good for viewing double star systems where a lot of emissions are in the doubly ionized oxygen range.
Oxygen III (O-III) are great for viewing diffuse and planetary nebulae. The views of the Veil, Ring, Dumbbell, Crescent and Orion nebulae are dramatically improved.
This SkyGlow filter increases the contrast of deep-sky objects like emission nebulae and darkens the background sky by blocking mercury vapor light transmissions and enhancing transmission in the hydrogen beta, doubly ionized oxygen and hydrogen alpha regions of the spectrum.
This UHC, or Ultra High Contrast, filter decreases the effects of light pollution caused by natural and artificial sources. With this filter, the background sky appears darker in the eyepiece, increasing the visibility of your favorite deep-sky objects. This filters out specific wavelengths of light to create high contrast and to make nebulae clearer and more visible, where normally, we may not be able to see it with our eyes alone.
Skyglow, which is caused by neutral oxygen in the atmosphere, as well as light from high and low-pressure sodium vapor lights and mercury vapor lamps, are suppressed significantly, which means you can view or image from areas of heavy light pollution.
These Zhumell 2” Filters are made with multi-coated glass to ensure scratch resistance and stability on the central wavelength or CWL. Each filter cell is made of lightweight, strong metal and is CNC machined, sand-blasted, black anodized, and then laser engraved.