Photoshop SIG |
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| Depth of Field | An article on depth of field with examples. |
| Hyperfocal Focusing | What is it and when would you use it. |
| Digital SLR Lens Properties and Terminology | SLR Lens 101 and an into to optics |
| Lens Tutorial | Optics with equations |
| Tamron Learning Center | How to Buy a Lens (note - Tamron is a lens manufacturer) |
| Depth of Feild Guides for PDAs | |
| photodo.com | Lens reviews, news and articles. |