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I have been waiting for the Baader ultra narrowband OIII to become available, I ordered it almost two years ago when they first came out. A few weeks ago I emailed Baader directly and the response was that they have no time frame as yet for these. They also indicated that they are working on transmission rates to better suit CMOS chips, with an indication to expect a price rise when they do come out.
I have the 3.5 nm Ha and SII but the 4 nm OIII is impossible to obtain and now they don't know when these will be available.
Brian
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