M-17, Imaged with an
AP 140 F7.5 Starfire at F5.7




M-17 taken with an AP 140 F7.5 Starfire refractor working at F5.7. STL11000 camera,
2 x 20 minutes H-alpha and 2 x 20 minute O3. Red = H-a, green = 1/2(Ha + O3), blue = O3 .
Image by Roland Christen.
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