ZWO 7nm SII Narrowband Filters
The ZWO 7nm SII 7nm filter is centred around 672.4nm (Ionised Sulphur). Deep in the red part of the spectrum it is common in deep sky objects. The SII filter detects faint feathery detail in nebulae that’s not seen in H-alpha.
1.25 inch suits the new ZWO 8 position 1.25 inch Filterwheel
31mm unmounted suits the new ZWO 8 position 31mm Filterwheel
36mm unmounted suits the new ZWO 7 position 36mm Filterwheel