>>4492540Technically Macro is 1:1. In practice, anything involving "small" subjects and/or higher than normal magnification is macro photography. Better to think of it as a general idea than a clearly defined rule, and if anyone gets all high and mighty over you using a 0.4x lens or something then that just means they're a massive faggot.
Back in the day when basically every lens was between 0.2x and 0.1x magnification, the only way to get proper macro photos was with a dedicated macro lens (or bellows). These days more and more everyday lenses feature higher reproduction ratios with 0.5x being fairly common and normally the point that companies will slap the Macro moniker on it. Hell, my 100-400mm lens has a 0.42x ratio without trying, and it would be more than enough for decent enough macro.