It 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 (i.e. skyglow).
From 2018, ZWO Made progress on narrowband filters with the new standard, providing better performance.
Name: ZWO New narrowband 1.25″ filter
Size: 1.25″
Thickness: 5.5mm+2.5mm(thread)
Glass thickness: 1.85mm
Thread: M28.5*0.6 male thread
Name: ZWO narrowband 31mm filter
Size: D=31mm
Thickness: 2mm
New OIII filter:
Both side will be fine.
尺寸:1.25英寸
厚度:5.5mm+2.5mm(螺紋)
玻璃厚度:1.85mm
螺紋:M28.5*0.6外螺紋
我們對我們的 Ha 濾鏡(ASI1600 單色相機,單幀,300s,MaximDL 中的 DDP)進行了測試: