http://www.astrodon.com/products/filters/e-series/
These are practically brand new. I've used them once for my image of the tarantula nebula and I've decided i need 2".
Ideal for someone wanting the flexibility of equal colour weighting of 1:1:1 and experience why they are the leading filters for ccd imaging.
Crystal clear not a mark or speck on them.
Cost me $490 delivered, yours for
$450 safely delivered.
Bundle with the filter wheel I have for
$660