From: "Greg Crawford" <gc
Date: Wed, 15 Mar 2006 11:15:13 +1100
Date: Wed, 15 Mar 2006 11:15:13 +1100

My Custom Scientific filters, bought through SBIG, seem to have deteriorated and
I am looking at replacing at least the V and R, possibly also the I filter. 

As far as I can see there are three suppliers in increasing order of cost:

Astrodon, who took over Schuler filters, have 1.25" VBR sets for $182, so approx
$61 each. See here: http://www.astrodon.com/products/product.cfm?CatID=4

Optec have UBVRI 25.4 mm filters for CFW filters wheels at $125 each. So $375
for VBR. See here: http://www.optecinc.com/optec_065.htm

SBIG's selling of Custom Scientific 1.25" BVI sets for $525. So $175 each. See
here: http://www.sbig.com/sbwhtmls/online.htm

This is quite a significant difference in price per filter: $61 vs $125 vs $175.
However, deterioration seems to be a problem and I am wondering whether users
have found some brands more resistant to deterioration than others.

- Greg





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