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Hubbly Swan with SII wings
SPX350 F4.5, ST10XME, Astrodon filters, SII5nm Ha5nm OIII3nm.
M17 must be one of the best nebs in Sag with its high dynamic range, I keep meaning to take a look at it through an eyepiece but never get round to it. It has lots of SII and OIII with mountains of gas.
The luminance was an Ha SII blend with Hubble mapped RGB.
The ST10 lifts up those faint levels very well, I am glad I got this CCD rather than the popular 8300 as I valued the sensitivity (especially narrowband) over size and the ST10 seems big enough, the Swan fits on reasonably well and most other objects seem to fit. I am now loving this CCD.
Ha+SII-12x10min
OIII-18x5m.
Thanks, John.
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