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Hi everyone,
My concern is star trails. They can been seen in the images attached. I was guiding with a Orion ST80 and DSI II Pro.
Here’s a single sub of 300s stretched and a crop from that sub. The crop is relatively close to the centre so I’m certain that this is not curvature. Also note that this is uniform throughout the image.
Not all subs are like this however. Approx 50% show similar star trails to this sub.
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