What is a macro lens?
Macro lenses are optimised for close focusing, and will give a magnification of at least 1:2 (the image on the film or sensor is half life-size) and more commonly these days, 1:1 (the image on the film or sensor is life-size), unaided. These lenses are usually, but not always, “prime” lenses (i.e., lenses of a fixed focal length), but there are a few examples of zoom lenses, such as the Nikon 70-180, that were designed specifically for macro use. True macro lenses are optically excellent; they are very sharp, have good contrast, and minimal distortion. The term “macro” is often misapplied on general purpose zoom lenses where there is a close focusing facility, but the magnification achievable is generally 1:4 or less, and the optical performance is usually not in the same league as would be expected from a purpose-designed macro lens.
Related Questions
- When I use Tamrons 90mm macro lens as well as some other lenses, the open aperture value displayed on the camera is smaller than designated on the lens. Is my lens defective?
- Is there a difference between the designation MACRO on a 90mm macro lens and a zoom lens?
- Does anyone have a suggestion on a good macro lens for the Nikon?
