Take a look at your camera, and there’s a good chance it’ll have this symbol: Φ — a small circle bisected by a long line that looks like a hieroglyph of Saturn. If you’ve always wondered what it means, today’s your lucky day: it’s called a “film plane mark” (or “focal plane mark”, depending on who you ask), and indicates exactly where the film (or sensor) plane is inside the camera body. One reason the mark is useful is that macro photographers often want to determine the exact distance between their subject and the film plane, and the mark can make this calculation much easier.
http://www.adorama.com/alc/article/Macro-Basics-AdoramaTV - Macro Photography Techniques and Tips - In this episode number 31, Mark will show you how to take those up close photos! Macro photography techniques allow unique opportunities to produce creative and dramatic photos and Mark shows us a couple examples. Macro Photography On Wiki: http://en.wikipedia.org/wiki/Macrophotography - "Quote" Macrophotography is close-up photography, usually of very small subjects. Classically a macrophotograph is one in which the size of the subject on the negative is greater than life size. However in modern use it refers to a finished photograph of a subject at greater than life size. The ratio of the subject size on the film plane (or image sensor plane) to the actual subject size is known as the reproduction ratio. Likewise, a macro lens is classically one lens capable of reproduction ratios greater than 1:1, although it now refers to any lens with a large reproduction ratio, despite rarely exceeding 1:1. Outside of technical photography and film-based processes, where the size of the image on the negative or image sensor is the subject of discussion, the finished print or on-screen image more commonly lends a photograph its macro status. For example, when producing a 6×4 inch (15×10 cm) print using 135 format film or sensor, a life-size result is possible with a lens having only a 1:4 reproduction ratio. Reproduction ratios much greater than 1:1 are considered to be the realm of photomicroscopy, often achieved with digital microscope. "End quote" http://www.adorama.com/alc/article/Macro-Basics-AdoramaTV Macro Photography Techniques and Tips Category: Howto & Style Tags: macro photography techniques mark wallace digital photography macro lens Adorama AdoramaTV camera License: Standard YouTube License