Tamron AF 28-75mm f/2.8 SP XR Di LD Aspherical (IF) with Built-In AF Motor for Nikon Digital SLR Cameras (Model A09NII)

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Tamron AF 28-75mm f/2.8 SP XR Di LD Aspherical (IF) with Built-In AF Motor for Nikon Digital SLR Cameras (Model A09NII)

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Excellent low light and fast action lens Great for portraits and creating shallow depth of field Fast 2.8 minimum aperture throughout the zoom range Includes Six (6) Year manufacturers warranty Nikon mount with built in focus motorc compatible with most Nikon DSLRs. The designation “Di” (Digitally Integrated Design) marks a generation of lensesc which have been specially adapted to the higher requirements of digital SLR cameras (APS-C and full frame).

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Tamron AF 28-75mm f/2.8 SP XR Di LD Aspherical (IF) with Built-In AF Motor for Nikon Digital SLR Cameras (Model A09NII)

Style: Nikon  |  Configuration: US Version Minimum focus distance of 0.33m over the entire zoom range for 1 - 3.9 maximum magnification Mechanical design improvements for downsizing the maximum diameter while minimizing changes in zooming torque Zoom lock mechanism for convenience in carrying the outfit 75 to 32-degrees Angle of view f/2.8 to f/32 Aperture From the Manufacturer This ground-breaking high-speed mid-range zoom is prized by pros and serious shooters for its fast F/2.8 constant aperturec evenness of illuminationc and its outstanding imaging performancec and by all photographers for its compact size and reasonable weight that make it feel like an ordinary standard zoom. These admirable characteristics have been achieved by the use of special XR and LD glassc the efficient use of aspherical elementsc and non-rotating internal-focus (IF) design. This remarkable zoom lens also focuses down to 0.33m (13”) (1:3.9 magnification) at all focal lengths for satisfying close-up performance and is compatible with APS-C and full-frame-format SLRs. Not surprisingly it is widely acclaimed as a classic. br br Worlds smallest & lightest lens br The most compact and lightest in the history of fast zoom lenses. Thanks to the revolutionary downsizing XR technology employed by Tamron in the development of high-power zoom lenses such as the 28-200mm and 28-300mmc the dramatic compactness that makes this lens the worlds smallest and lightest is achieved. Its compactness makes it look and feel like an ordinary standard zoom lensc yet the versatility that a fast constant maximum aperture offers will definitely reshape your photographic horizons. br br SP AF28-75mm F/2.8 XR Di Features br br Digitally Integrated (DI) Lenses for the Best Imaging Performance br Di (Digitally Integrated Design) is a Tamron designation that applies to lenses that have been optimized for digital capture using advanced multi-coating techniques and optical designs that assure excellent image quality across the entire picture field. Because of these characteristicsc Di lenses provide outstanding performance on cameras with full-frame and APS-C format sensors as well as on 35mm film. br br Low Dispersion (LD) Glass for Greater Lens Sharpness br Low Dispersion (LD) glass reduces chromatic aberration Low dispersion (LD) glass elements in a lens help reduce chromatic aberration; the tendency of light of different colors to come to different points of focus at the image plane. Chromatic aberration reduces the sharpness of an imagec but glass with an extremely lowdispersion indexc has less of a tendency to separate (defract) a ray of light into a rainbow of colors. This characteristic allows the lens designer to effectively compensate for chromatic aberration at the center of the field (on axis)c a particular problem at long focal lengths (the telephoto end of the zoom range)c and for lateral chromatic aberration (towards the edges of the field) that often occurs at short focal lengths (the wide-angle end of the zoom range.) br br Super Performance (SP) for Discriminating Shooters br Tamron SP (Super Performance) series is a line of ultra-high-performance lenses designed and manufactured to the exacting specifications demanded by professionals and others who require the highest possible image quality. In creating SP lenses Tamron’s optical designers put their foremost priority on achieving superior performance parameters—they are all designed to a higher standard with little regard for cost constraints. As a resultc Tamron lenses bearing the SP designation feature impressive and innovative designs that have established an enviable reputation for excellence among those knowledgeable photographers that demand the very best. br br Extra Refractive Index Glass (XR) br Special glass for better performance and more compact lens designs Extra Refractive Index (XR) glass can bend light rays at steeper anglesc thereby decreasing the physical length of the lens while enhancing imaging performance by minimizing optical aberrations. This has allowed Tamron to develop a line of shorterc smaller-diameterc lighter lenses without sacrificing lens speedc and actually upgrading image quality compared to older designs. XR glass is costlier than conventional glass but it yields enhanced optical power distributionc making possible many of the outstanding and innovative lens designs that bear the XR designation. XR glassc with its superior light-bending powerc makes it possible to design a short-barrel lens with the same light-gathering ability (aperture value) as a long-barrel lens—even with a smaller lens diameter. By using this principle Tamron has been able to shorten the length of the entire optical system and produce lighterc more compact lenses of the same speedc and also to provide greater zoom ranges in lenses that are much more convenient to carry by hand. br br Internal Focusing (IF) System br Internal focusing provides numerous practical benefits to photographers including a non-rotating front filter ring that facilitates the positioning of polarizing and graduated filtersc and more predictable handling because the lens length does not change during focusing. Even more importantc Tamron’s Internal Focusing (IF) system provides a much closer minimum focusing distance (MFD) throughout its entire focusing range. In additionc IF improves optical performance by minimizing illumination loss at the corners of the image fieldc and helps to suppress other aberrations that become more troublesome at different focusing positions. br br Aspherical Lens Elements (ASL) br Aspherical Lens Element Tamron uses several hybrid Aspherical lens elements in many lenses bearing the Aspherical designation. These innovative optics allow us to achieve the ultimate in image qualityc and at the same time produce lenses that offer remarkable zoom ranges in extraordinarily compact packages. By perfecting theses cutting-edge advances for series productionc Tamron has advanced the state of optical designc and virtually eliminated spherical aberration and image distortion from the high-power-zoom series.Through the effective application of Hybrid Aspherical Technologyc one lens element can take the place of multiple elements without compromising performance. This is what allows us to produce remarkably compact long-range lenses that deliver a uniformly high level of image quality at all focal lengths and apertures. br br Zoom Lock (ZL) br Another original Tamron mechanical engineering concept is the Zoom Lock (ZL)c a simple convenience feature that prevents undesired extension of the lens barrel when carrying the camera/lens unit on a neck strap. br br br br br

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First of allc this lens is fantastic. There are a few reasons whyc and I will go over themc but if you are looking for a great walk around lens that is nice and fastc look no further. This lens is heavyc built wellc and produces wonderful images. br brVisit Tamrons site to download the lens guide PDF: http://www.tamron-usa.com/lenses/prod/2875mm.asp#ad-image-0 br brLets get down to brass tacksc the pros and cons of this lens. I will tell you why I like this lens and how I use it. br brI am a working photographer. I earn a living shooting weddings and events in Hampton Roadsc Virginia. This lens helps me earn money because it produces great results in a wide range of applications. To be truthfulc I push the limits of both my camera and the lighting situations I find myself in and would consider my knowledge at an expert level. br brFirst there must be a basis for comparison. Lenses are not created equalc and the price of a lens is volatilec that is to say that once a professional level of optics are attainedc very small advances in performance can come at a very high cost. brThereforec I consider the Categoryc Sensor Size the lens is designed to work withc Distortionc Chromatic Aberrationc Aperturec and Pricec in that order. br brCATEGORY: Constant f2.8 28-75 Full Frame Lens. brThis Lens is competing with other Lenses with constant aperture at f2.8 with a focal length between 16-75. Tamron brDoes offer a weather sealed version of this lens for around $1100. It has a pezio drive and is directly competing with the Nikon 17-55mm f/2.8G ED-IF AF-S DX Lens. You can find these two lenses here: br brNikon: http://www.amazon.com/Nikon-17-55mm-2-8G-ED-IF-Nikkor/dp/B000144I2Q $1399 brTamron: http://www.amazon.com/Nikon-17-55mm-2-8G-ED-IF-Nikkor/dp/B000144I2Q $1099 br brSENSOR SIZE: brNoc the lens does not have a sensor in itc but it is made for a Full Frame camera. You can use this lens on an APSC sensor sizec which is good. Some even believe that you will have better results using a FF lens on an APSC sensor because of the crop factor pulling the sharpest part of the lensc the center areac into focus and discarding the edges of the lens. br brDISTORTION: brDistortionc This is a legacy designed lens. This is important because the lens was designed when cameras did not have built in line correction and micro correction. Moreoverc this lens was designed when the average consumer did not have access to programs like DxO Optics Pro 9 and Light Room (both of these programs have built in profiles to correct lens distortion on specific camera bodies). br brThis is important to you because it was designed when the lens had to be good optically because corrections in post production were very difficult. This lens Hit the market in the at least 2003. br brThis lens has some soft areas wide open at 28mm. They are mainly in the edges of the lens. Center is tack sharp. This is not a bad thing thoughc remember that an aperture of 2.8 should give a very shallow depth of fieldc and an extremely narrow focus. Therefore one would expect the edges to be soft. I absolutely love this. DXO optics has tested this lens and approves of it. But dont let someone elses numbers confuse you. All their numbers mean is that it is a great lens for the price. Im sure that someone will begin comparing this statement to some $4k plus lensc but rememberc this lens is not competing in the $4k arena. It doesc howeverc hold up very well. br brIn my use I have seen very little to no distortion. I take portraits of individuals and groupsc so I would not expect to see a lot of distortion. If I were taking photo of buildingsc any distortion the lens has would become more apparent. br brCHROMATIC ABERRATION brSo far I have seen nothing that I would say detracts form the image. The Lens is prone to flaring when pointed toward direct bright lightc like a sunsetc but what better of an image to get than a silhouette of a bride and groom with a natural lens flair For me its greatc maybe not so much for you. br brAPERTURE brThis is an f2.8c constant throughout the zoom rangec right Yes. but do you know what that means Are all 2.8s equal The answer is both yes and no. To make this simplec aperture is nothing more than a mathematical ratio. it actually looks like this f 1:2.8c We just drop the 1: and display it as f2.8. br brSo now that you know its a ratioc what is it competing It is comparing goal length to the diameter of the aperturec or how big of a whole the aperture has at a known focal length. To find out how big your aperture is in MM just divide the focal length by the current aperture. So a focal length of 100mm at an aperture of 2 would be 100mm/250mm. This means that your aperture would be physically open by 50mm at a focal length of 100mm. br brThis is important becausec as ratios are always comparing aperture diameter to focal lengthc they should be constant across different lenses. So you could say that a 50mm prime at an f2 has an aperture diameter of 25mm. The example above showed that a lens with a focal length of 100mm at an f2 would be 50mm in diameter. This is correctc but would be costly to build and quite heavy. Instead many lenses have an articulated aperturec which is to say that their maximum aperture changes throughout the zoom range. you will usually see something like an 18-55 f3.5-5.6. That means that on the wide end of the lens the max aperture is 3.5c so 18/3.55.14mm and 55/5.69.82mm. br brThis lens example from above is almost always going to be bad in low lightc and would probably be a kit lens. The Tamron Lens that this article is about is a 24-75 f2.8 which means that the max aperture on the wide end is 24/2c88.57mm and on the zoom end the aperture diameter is 75/2.826.78mm. Lets compare them: brCommon 18-55 f3.5-5.8 Max Aperture diameter wide angle: 5.14mm max aperture zoomed in: 9.82mm brTamron 24-75 f2.8 Max Aperture diameter wide angle: 8.57mm max aperture zoomed in: 26.78mm br brBigger diameter aperture is better because it gives you more usable light in low light situationsc it also gives you more control on depth of field. br brPRICE: Its $500. This is a steal for this lens. It works in many situations and gives you the most control over your creativity- considering the alternativesc it is about ½ or less the price. I have truly enjoyed this lens and you will too. My suggestion is to buy the body of the camera you want- do not buy a bundled lens- and get this lens as your walk around lens. br brCheck out samples with this lens and others buy visiting www.RobertHammPhotography.com

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