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All,I think I have a simplified version of the Excel reduction sheet ready to go. I think the math behind it is sound (see attached PDF), but I would like someone else to check it to make sure I didn't neglect anything. For this introductory-level reduction method, air mass correction is absent, but then again the difference over the field-of-view of a DSLR camera should be small. This would simply correct the instrumental magnitudes going into the equations anyway so I think it's fine.Let me know what you think,Brian