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Yellow Streaks
Why do I see a yellow band of light across my photos while shooting indoors?
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Formulaic Conundrum
The focal length of a lens is calculated as the distance between the lens and the image plane, when focused at infinity. If that is the formula, why is the length of my 200mm lens only 136mm?
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Legal Ownership of Photos
I want to post my photos on the internet. How do I get a registered copyright over my images to avoid theft?
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On Angle of View
Could you please tell me what “angle of view equivalent to that of a 24–1000mm lens” refers to?