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Message: <blockquote data-quote="geethq" data-source="post: 14512218" data-attributes="member: 4364">Common Lens Terminology18 - 55mm = focal lengths covered by the lens, 18mm at the widest and 55mm longest ("zoom").f1.4 = aperture of the lens. Will either show a single figure or a range. Fast = lenses with a small f-number (wide aperture)Macro = for close up magnificationPrime = a fixed lense as opposed to telephoto/zoom lenses that have a range of focal lengths.Normal = a lense that matches the human vision (50mm on full frame cameras)Wide = focal length less than "normal", can fit more into the scene than normally seen with naked eye.Fisheye = ultra-wide angle lense that produces imagery that looks very distorted and bubble-likeTelephoto = zoom, focal legth longer than normal offering magnification of the target objectCanon Lense TerminologyEF = Electronic Focus - Newer lenses since 1987. Don't buy older "FD" lenses for modern cameras.EF-S = EF lenses for digital cameras with non-full frame cropping image sensors (eg. 350D, 20D)L = Canon's top range of posh lenses. Expensive but the best Canon make.DO = Diffractive Optic - controls "chromatic aberration" problems and reduces size and weight.IS = Image Stabilisation, reduces camera shake.USM = Ultrasonic Motor, faster, quieter, lighter motor. Use sound waves apparently.Nikon Lense TerminologyAI = stands for Automatic Indexing (metering). AF = autofocus, come in "AF-D" AND "AF-S" types. AF-S are more expensive and has internal motors are Nikons version of "USM"AF "VR" = Vibration Reduction, basically Nikons Image Stabilizing technologyMicro = What Nikon calls MacroDX - Nikon's crop format (all DSLRs below D700)VR - Vibration Reduction - the current marketing panacea as everybody suddenly has shaky hands)DC - Sigma speak for 'only suitable for crop format'ED - Extra Dispersion glass (better than not ED)IF - Internal Focusing (front element doesn't rotate, which is good)motorized lensesSigma HSM, Canon USM, Nikon AF-S, Pentax SDM, Sony SSM, Tamron USD, Tamron PZD, Olympus SWD, Sony SAMimage stabilization Sigma OS, Canon IS, Nikon VR, Tamron VC,Panasonic O.I.S, Panasonic MEGA O.I.S, Nikon VR II, Canon IS II, Samsung OIS, Sony SteadyShot, Sony SteadyShot Active</blockquote>

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