Hi all,
I've come across this mob from the USA who produce astronomical filters, such as OIII.
http://stores.ebay.com.au/BJOMEJAG-E...i.html?_fsub=2
They have been very careful not to use terms as 'UHC' or 'UHC-S' but very specific in the transmission description. This alone has impressed me as these terms have be misrepresented by some high profile companies from thier orthodox definitions.
What blows my socks off is the price of a 2" Hb & OIII filter for $US105!
They also sell very narrow band OIII filters for CCD imaging.
Maybe they are the manufacturer of the branded types?
Has anyone had experience with these?
Cheers,
Mental.