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I'm talking about seeing astigmatism without eyeglasses and in the in-focus image.
YMMV I guess. We all have different eyes and eye conditions at the end. Personally for me I've found the formula is much close to what I see in real life than the graph. I cannot test exactly as I do not have 15mm eyepiece - only 13mm and 18mm ones.
Also it's a bit difficult to judge by the graph as diopters are not linear on the X axis. Where is exactly 0.75?
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