ZWO Narrowband Filter Set 7nm
FOR SALE –
as new
Narrowband filters do not eliminate the effects of light pollution or increase the object’s brightness. But, in many cases, they increase the contrast between nebula and night sky, not brightening the nebula.
They can reduce the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (ie. skyglow).
This filter set comprises an OIII, an H-alpha and an SII in 7nm bandwidth for imaging in Hubble Palette (OIII 501nm, Ha 656nm, and SII 672nm).
• Thickness is 5.5mm + 2.5mm for the thread
• Size is 1.25 inch
• Original packaging
For more information, see
https://astronomy-imaging-camera.com...nd-1-25-filter
Local pickup (Brisbane) preferred but postage, (+ insurance, tracking, if required) at buyer’s expense.
Selling for $517 ONO (retail for $739). Will consider selling filters separately.
Regards
Paul