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I've repeated the same experiment tonight.
Image 1 is IDAS LP filter/barlow/Trius (barlow to Trius is 80 mm, 1.11 arc-sec binning 2x2. Exposure 5 min.
Image 2 is IDAS LP filter/barlow/Empty filter wheel (no carousel) (barlow to Trius is 83 mm, 1.05 arc-sec binning 2x2. Exposure 5 minutes.
Both images stretched exactly the same in CCDStack.
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