I have for sale Set of 2" Orange Bright Narrow band filters - $350.00
OIII filter - The FWHM of this filter is 22nm or less
SII filter - The FWHM of this filter is 12nm or less
Hydrogen Alpha (H-α) - The FWHM of this filter is 12nm or less
The OIII and SII still in the cases unused the HA only used a couple of times
Only couple of months old
For further details see website
www.ob-
optics.com/
Please PM if interested