Lunch atop a (Springfield) skyscraper

Lunch atop a (Springfield) skyscraper
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Wide-angle lenses are the ones with focal length shorter than longest edge of imaging surface (36mm on 35mm full frame, about 24mm on APS-C).

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Wide angle macro - why does just releasing and twisting my lens change the focus distance?

I have been looking at wide angle macro photography recently and wanted to try some out using a Sony a55 and my Sigma 10-20. Tried an extension ring, but it did not work; after Googling I discovered ...