I finally made it back over to NGC7538 to start picking up [OIII] exposure time. I have 8 hours each of Halpha and [SII] and now I have four hours of [OIII].
If I am lucky I can pick up another four hours or so tonight and take it up to a full 24 hours. If successful, that will be a new record for me.
http://www.narrowbandimaging.com/ngc7538_mk1sn2_cm10_geg_s2hao3_page.htm
this was shot with the 18" f/12.6 cassegrain used with a focal reducer to take me down to f/7.1
This isn't a nebula I see imaged very often and it is the first tricolor emission line image I have seen of it anywhere.
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