ZWO 31mm OIII 7nm Unmounted Filter (ZWO-OIII7NMD31)

ZWO 31mm OIII 7nm Unmounted Filter (ZWO-OIII7NMD31)Narrowband filter do not eliminate the effects of light pollution or increase the objects brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula. The ZWO narrowband O III 7nm filter is designed for nebula observation allowing 7nm bandwidth of light centred on a wavelength of 500nm through, which corresponds to OIII emission lines, blocking out all other light. Adding the ZWO O III Narrowband

field flatteners

as the ambient temperature falls

at 53x with a 6mm exit pupil

87") Focal Length: 1000mm (39") Focal Ratio: f/5 Focal Length of Eyepiece 1: 20mm (

Multi-layers anti-reflection coating

Felt-lined interior surface captures moisture and reduces stray light

99 at the highest resolution Up to 94 (7 fps at full frame) Up to 90 (8 fps at full frame) Back Focus Distance: 13

When the object is ready to view

) It may be necessary to remove the "stop" screw from the bottom of the Dovetail to fit non-TeleVue finder brackets

To tighten the ring around the accessory

optical accessories

High-Sensitivity Type 4/3 CMOS Image Sensor that Supports 4K for Astronomic Cameras and Industrial Applications