| FSGN | focal sclerosing glomerulonephritis |
|---|---|
| FSGS | focal segmental glomerulosclerosis |
| FSH | fascioscapulohumeral; focal and segmental hyalinosis; follicle-stimulating hormone |
| FSS | focal segmental sclerosis; Freeman-Sheldon syndrome; French steel sound |
| FTBE | focal tick-borne encephalitis |
| focal length |
Technically the distance in millimetres between where light from infinity is focused and the optical centre of the lens. A 35mm SLR camera has interchangeable lenses that can range in focal length from around 7 to 17mm which are usually fisheye, 17 to 35 are considered wide angle. 50mm is called the standard lens as it has the same equivalent focal length as the human eye. Anything longer is a telephoto lens.
출처: www.tribalcog.com/learn/glossary.shtml
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