Voigtländer focus table

This Voigtländer Bessa 6×9 from around 1947 has an embossed metal table on the back which allows the photographer to calculate the depth of field based on the aperture and the focus distance. It’s still as accurate today as it ever was, provided you are using a 110mm lens. If you’re not sure how to read the […]

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Focal lengths on different formats

Consumer photographic lenses are almost always sold by their focal length when used on a 35mm camera (or full-frame professional DSLR). It’s already confusing enough to work out what their effective focal length is when used on an APS-C sensor (most consumer DSLRs), but since I’ve been getting into medium-format photography it’s even more confusing […]

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Federated tables in MySQL

Yesterday at work I had the need to create a federated table in MySQL. I read about the federated engine and thought I had it sussed. I noted: Beginning with MySQL 5.1.26, the FEDERATED storage engine is not enabled by default in the running server; to enable FEDERATED, you must start the MySQL server binary […]

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