Bassnut
18-12-2009, 07:15 PM
Hi All
Its been a very long time since I posted a pic, the weather in Sydney has been appalling for months, this effort has taken that long to collect (plus huge mucking around setting up from scratch).
Anyway, this is my 1st one with my RCOS and PME back here in my OBs in Sydney, with some new toys attached (rotator, OAGer, AO8).
I was pretty keen to up the anti with this setup, but object choice was not the best. Its dim and it was very low in the sky, seeing was terrible, and I chose to to image at 2275 mm FL, given I have an OAGer and PME now, but flexure is gone, and I have perfect guiding. 3nm Ha is painfull with a 10" at 2275 in urban skies with bad seeing, the neb ADUs were small, and buried in noise.
The 10" also required 20min subs with the 3nm Ha and 6nm SII and OIII filters, I could get away with 15 min subs on the 12" meade, so the apature drop was a bit painfull, but focus was tighter.
The subs were 10hrs Ha bin1, 4 hrs OIII bin2, 3 hrs SII bin2 processed as Ha;SII;Ha;OIII, mapped as LRGB.
The stars look wonky on close view, and I intend imaging in RGB for natural stars so there is still work to do.
Anyway, here (http://fredsastro.googlepages.com/) is NGC3576 in NB for your pleasure.
Its been a very long time since I posted a pic, the weather in Sydney has been appalling for months, this effort has taken that long to collect (plus huge mucking around setting up from scratch).
Anyway, this is my 1st one with my RCOS and PME back here in my OBs in Sydney, with some new toys attached (rotator, OAGer, AO8).
I was pretty keen to up the anti with this setup, but object choice was not the best. Its dim and it was very low in the sky, seeing was terrible, and I chose to to image at 2275 mm FL, given I have an OAGer and PME now, but flexure is gone, and I have perfect guiding. 3nm Ha is painfull with a 10" at 2275 in urban skies with bad seeing, the neb ADUs were small, and buried in noise.
The 10" also required 20min subs with the 3nm Ha and 6nm SII and OIII filters, I could get away with 15 min subs on the 12" meade, so the apature drop was a bit painfull, but focus was tighter.
The subs were 10hrs Ha bin1, 4 hrs OIII bin2, 3 hrs SII bin2 processed as Ha;SII;Ha;OIII, mapped as LRGB.
The stars look wonky on close view, and I intend imaging in RGB for natural stars so there is still work to do.
Anyway, here (http://fredsastro.googlepages.com/) is NGC3576 in NB for your pleasure.