Regular price
$174.00 CAD
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Product details
- SKU ZWO-SII7NM125
The ZWO SII 7nm Narrowband Filter passes light at the 672nm wavelength with a bandpass of 7nm for nebula observation. It is suitable for visual observation on most emission nebulae, planetary nebulae and supernova remnants. Use this SII (Sulfur II) with H-alpha and Oxygen III narrowband filters (SHO Set) for tricolor CCD astrophotography.
This rendition of the ZWO SII 7nm Filter is housed in a 1.25" threaded metal cell and can be used in 1.25" filter wheels or the ZWO 2" filter drawer with a 2" to 1.25" filter adapter installed.
How to Use the ZWO SII 7nm 1.25" Filter...
- A Hubble look can be made by the combination of H-alpha, OIII-CCD and SII-CCD, such as the famous “Pillars of Creation” (M16 Eagle Nebula)
- Narrowband imaging with SHO set (H-alpha, OIII-CCD and SII-CCD) can be done with the moon in the sky so your equipment is not sitting dormant until the next new moon.
Specifications
- Size: 1.25″
- Thickness: 5.5mm + 2.5mm(thread)
- Glass thickness: 1.85mm
- Thread: M28.5*0.6 male thread
- FWHM:7±0.5nm
- Fine-optically polished to ensure accurate 1/4 wavefront over the both surfaces
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About 90% transmission at SII line 672nm
- Infrared wavelength 700-1100nm cut-off
- <0.1% transmission of off-band, OD3 (Optical Density)