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In the case of M22, it doesn't have the bright core like M5 does, so 5 minute subs work well on this shot. I love how the cluster is just a dense group of stars that practically blends in with the Milky Way. So cool!
Scope: Vixen ED103S with WO Flat 4 0.8x FR/FF
Mount: Orion Sirius EQ-G with GoTo
Guiding: Meade DSI Pro and PHD Guiding
Guide Scope: William Optics ZenithStar 66
Camera: Canon EOS 1000D
Special Settings: None
Exposure: 1 hour (12 x 300s)
Processing Software: Acquired in Nebulosity with High Dither, Calibration and Stacking in PixInsight, Levels/Curves/Enhancements in PixInsight & Photoshop
Support Files: 20 flats, 20 bias, 20 darks