Fraunhofer Lines: Outdoor Photo Through Bandpass Filter

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    Fraunhofer Lines
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SUMMARY

Taking an outdoor photo through a bandpass filter that isolates a specific Fraunhofer line will not result in complete darkness, as there is always some residual light present. While theoretically, the image should be dark, practical filters cannot perfectly isolate these lines, leading to some illumination. Additionally, the discussion highlights the high cost of narrow band filters, making them inaccessible for average experimenters.

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If you take an outdoor photo through a bandpass filter that only let's light through in a Fraunhofer line would it be completely dark, like night? Or would it have some daytime illumination?
 
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In theory it would be dark yes. However, what comes in at those lines is never entirely zero, and you will never have a filter that only exactly filters that line.
 
OK, thanks. I also see that such narrow band filters are prohibitively expensive for the average experimenter.
 

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