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I've been studying photography for a couple years now and I've really been enjoying it. I love floral photography and I take pictures of flowers up close. Sometimes I will set the aperture wide to get a blurred background and I will have the ISO at a higher setting in order to capture the full picture. My biggest concern is I may be letting too much light into the lens. Is this a valid concern?

If I sell my photography for small amounts of money, 20 to 30 dollars, and only sell to friends and family, can the government say I am running a business?