I have some excellent 50mm Astronomik Filters available for sale
All are in perfect condition in their original cases and all are the Astronomik low halo variety with manufacture dates between late 2010 and late 2011 (all have serial numbers for verification)
As a bonus endorsement, each filter listed below has been used to produce an award winning image (ROG Astronomy Photographer of the Year, David Malin Awards, South Pacific Star Party Astro's and APOD) using a variety of scopes and cameras...so, don't worry they work perfectly well
I have priced them well below replacement and include postage in Oz, so haggling wont be necessary
Ha OIII SII 50mm
Square 11.8nm unmounted set (circa Oct 2010): $750
[SOLD]
Halpha 50mm
Square 11.8nm unmounted (circa Nov 2011): $250
[Still Available]
Luminace 50mm
Square unmounted (circa March 2011): $110
[Still Available]
SII 50mm
Round 11.8nm unmounted (circa Nov 2011): $175
[Still Available]
Cheers
Mike