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This image was the stack of 15 light and 10 dark frames by Sequator with the following setting: Composition (Align stars, Freeze ground, Selective), Sky regions (Irregular mask), Auto brightness (On), HDR (On), Reduce light pollution (Uneven), Color space (Adobe RGB). Dfine2 with luminosity mask was applied in Photoshop. Keep increasing the focal length to evaluate the impact of distortion of wide angle lens, the motion blur/trail caused by long shutter, and the level of details improvement with longer focal length. Camera: Canon 7D Lens: Canon EF-S 10 – 22 mm Focal length used: 22 mm ISO: 6400 Aperture: 4.5 Shutter: 13 s

Aperture: 4.5	Shutter: 13 s
ISO: 6400	Flash:
FL: 22 mm	Lens: EF-S10-22mm f/3.5-4.5 USM

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