This lens shows image circle at 220mm @ f/22. On my 5x8 camera (yes, you read that correctly, it's 5x8)... there is what seems to be even illumination in the corners even at f/5.6. The diagonal for this format is 238mm. I thought I understood that an image circle is usually larger at higher f-numbers. What am I missing? How is this lens covering my format?
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