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![Appendix K Flash guide numbers, apertures and distance - Langford's Starting Photography, 7th Edition [Book]](https://www.oreilly.com/api/v2/epubs/9781317552833/files/images/fig_323.jpg "Appendix K Flash guide numbers, apertures and distance - Langford's Starting Photography, 7th Edition [Book]")
Appendix K Flash guide numbers, apertures and distance - Langford's Starting Photography, 7th Edition [Book]
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