after seeing ken's nice HH555 that spliced RGB stars atop an emission line image, I think it is appropriate to see what a pure emission line image looks like.
This was shot using 3nm Custom Scientific filters from my light polluted backyard in the San Francisco Bay area back in 2006 using an 18" f/12.6 classical cassegrain used at 3366mm and a KAF3200ME sensor to give an image scale of 0.42"/pixel.
this is the first high resolution image of the area I had seen taken using this multispectral wavelength ordered palette. I had taken an image of the same area using a coarser image scale in 2004 and the same filters but it wasn't as highly resolved as is this one.
2006:
http://www.narrowbandimaging.com/hh5...2hao3_page.htm
2004:
http://www.narrowbandimaging.com/ic5...color_page.htm
back in those days a high resolution sensor was 3.2mipixels. My but we have come a long way!
http://www.narrowbandimaging.com/ima..._10hrs_vga.jpg