Dear All
I have updated my photometry filters so now have a spare set of BVRI filters.
They are standard 1.25" filters.
They can be used for BGR imaging but have more overlap than dedicated tricolour filters. There main use is multicolour photometry. They are very close to the standards and my transform figures are close to nil.
All are parfocal. They are the older type of Schuler filters made from coloured glass and are described here
http://www.astrodon.com/products/fil...ric_-_schuler/
I have used these filters for lots of photometric measurements. They have always lived in an enclosed filterwheel and have not been exposed to any moisture. The V filter has no sign of crystalization.
The newer replacement filters sell for US$150 each.
I would like to sell them as a set as I only have the 1 box for them.
$200 for the set of 4 or $50 each if no one wants the set plus postage.
