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Filter 1.25" vignetting for larger sensors

johnh

By johnh
in Imaging - Discussion

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johnh

johnh

Posted
Posted

Thinking of buying QHY9 but at F4.53 with ATK-EFW, these smaller filters cause V is there a formula to give me an idea of how much V I will get with distance of sensor from filter - a light ray construction would be ideal to show were shading would occur?

JohnH.

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