Here is an S2/Ha/O3 version of M16 taken using an AP180EDT with a Microline 8300 using Custom Scientific 4.5 nm filters. All subexposures were 15 minutes and the total time was approx 9.5 hours. I need to update the webpage to reflect the true exposure time, as I am aware it says 12 hours (made a mistake when I created the page)
http://www.narrowbandimaging.com/m16...3_cs4_page.htm
http://www.narrowbandimaging.com/ima...12hrs_svga.jpg